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Roads


Could a Fairfax school turn into an urban street grid?

In 2019, the private school Paul VI will move to Loudoun County from its Fairfax City campus. Plans for what to do with the land are starting to take shape, and there's a big opportunity to make the space walkable and transit-friendly.


Paul VI and the surrounding area. Image from Google Maps.

The 18-acre Paul VI campus is located along Fairfax Boulevard (Route 50/29), where the City of Fairfax wants new commercial development. It's across the street from a shopping center anchored by H-Mart, a popular Asian grocery store. Immediately east and west of the campus are detached houses and garden apartments, and immediately south are Pat Rodio Park and the Chilcott baseball field.

The Roman Catholic Diocese of Arlington owns the land Paul VI sits on. It has hired a developer, the IDI Group, to come up with a plan for developing it and to work with Fairfax City through the rezoning and special use permit process. The Archdiocese will ultimately sell the land, presumably to a buyer who wants to carry out the approved plan (that could be the IDI Group).


Paul IV. Image from Google Maps.

Paul VI is a chance to make Fairfax Boulevard walkable, inclusive, and sustainable

Most of Fairfax Boulevard consists of large commercial lots dominated by surface parking, but Paul VI's redevelopment could mean a more compact and walkable street grid. A private drive and parking lot on the Paul VI property currently separate two segments of Cedar Lane, a residential street that extends to Chain Bridge Road. The redevelopment could connect these segments of Cedar to one another and to new internal streets.

While Fairfax Boulevard has not traditionally been a place to build new housing, a 2007 master plan for the street says more residential units would make the area more vibrant and economically successful. The plan also envisions a mix of stores and offices along Fairfax Boulevard.

A nearby piece of land increases the chance for a smart growth plan

Coincidentally, last month Fairfax City also received an application for the redevelopment of the Breezeway Motel and adjacent garden apartments, located on a five-acre site just 300 yards from Paul VI. AvalonBay Communities has filed an application to redevelop the Breezeway and adjacent Fairfax Gardens apartments, as well as several smaller properties, as a 351-unit apartment building, and 11 townhomes.

As it stands, that apartment building would span two blocks and break up the street grid that currently exists, as well as replace relatively affordable housing with what are likely to be far more expensive units.

If the city reviews the Paul VI and the Breezeway projects in the absence of a comprehensive framework for redevelopment, it could miss opportunities to create better transportation connections and plan the right mix of uses. Fairfax City will update its comprehensive plan over the next year and a half, and that could be an opportunity to better coordinate the redevelopment of these two areas.

Community members recently chimed in

Last week, IDI Group held a community meeting to gather ideas about the property's future use. Neighbors, local officials, city staff, and others in the community called for the development to consider the "big picture," including the proposed Breezeway development as well as other nearby sites.

Participants also raised concerns about how redevelopment could affect transportation, particularly the risk of significant cut-through traffic in adjacent neighborhoods that don't have sidewalks. They also voiced a desire for the development to "fit in" with what's already in the area and for planning to account for walking and biking, along with hope that the existing building could be (at least partially) reused and that the site could potentially be home to a youth center, park, and open space.

At a follow-up meeting on March 10, IDI Group will report back to the community on the information gathered at the February 11 meeting and present its initial concept for redeveloping the site.

The Paul VI site has the potential to begin the transformation of Fairfax Boulevard into a well-designed, walkable street with sidewalks, street trees, on-street parking along local lanes, and street-oriented buildings. It is time for the city to implement its master plan and revitalize Fairfax Boulevard, a primary economic engine.

Bicycling


DC will swap driving lanes for bike lanes in four key places

Around the District, four new sections of bike lanes and protected bikeways will replace existing driving lanes. These are part of four miles of planned new segments that will close gaps in the city's bike infrastructure.


Photo by Dylan Passmore on Flickr.

They'll focus on four major areas: the Metropolitan Branch Trail, the Klingle Trail, downtown, and Piney Branch Road, near Catholic University.

The projects are part of an amendment the District Department of Transportation (DDOT) is submitting to the Transportation Planning Board's long-term plan. DDOT is proposing to complete all of them this year, an undertaking that would cost $1.35 million.

Here's a big-picture look at all of them:


Map from MWCOG.

Metropolitan Branch Trail

Three of the eight projects are related to the Metropolitan Branch Trail. One would cut Blair Rd NW from three lanes to two lanes from Peabody Street to Aspen Street (a total of 0.73 miles) to allow for that section of the trail to be added in.


Blair Road with a protected path. Image from DDOT.

Two other projects would, functionally if not explicitly, extend the trail south from Union Station to the National Mall. One would remove a lane from Louisiana Avenue from Columbus Circle to Constitution Avenue in order to add in a 0.42 mile long protected bikeway. The other would remove two lanes from the stretch of Constitution Avenue that runs from 1st to Pennsylvania Ave NW to add in 0.23 miles of protected bikeway.

Klingle Trail Connection

Another project would remove half the lanes on Klingle Road between the under-construction Klingle Trail at Porter Street and Adams Mill Road. This would allow for 0.31 miles of separated bike lanes on both sides of the street, which will help to connect Mount Pleasant and the new trail.


Image from Google Maps.

East side downtown protected bikeway

The longest project on the list (1.6 miles), this is the bike facility that has been the subject of so much media attention. It would add protected bikeways to 5th, 6th or 9th Street NW.


Image from DDOT.

Closing bike lane gaps

The remaining three projects would close gaps in the current bike network. The first, in Edgewood, would remove a driving lane on 4th St NE between the existing bike lanes that end at Lincoln Road and the existing bike lanes at Harewood Road and add 0.27 miles of bike lane in their place.


Image from Google Maps.

The second would remove one of two driving lanes on the one-way section of Harewood Rd NW on the south side of the Soldier's Home Cemetery and replace it with a separated bike lane (I assume bi-directional). It would be 0.2 miles long between Rock Creek Church Road and North Capitol.


Image from Google Maps.

The last and smallest project, at 0.11 miles, would close a small gap in the bike lanes on Piney Branch Road NW between Georgia Ave and Underwood Street, again by removing a driving lane.


Image from Google Maps.

The Transportation Planning Board has opened a 30-day comment period on these changes.

There are other new bike projects in the works around the region. The I-66 Multimodal Improvement Project includes bike and walking improvements, and a project to extend VRE to Haymarket will include three new stations with "bicycle access." The Crystal City Transit Way (BRT) promises bicycle and pedestrian facilities improvements, and the I-66 Outside the Beltway project notes that Bicycle and Pedestrian accommodations in the corridor are included as part of the Preferred Alternative.

Cross-posted at The WashCycle.

Roads


Why Arlington might not sue Virginia over I-395 this time

This is part two in a series the 395 HOT lanes. Read part 1 to understand what happened the last time they were proposed.

VDOT has proposed converting HOV lanes on I-395 into High Occupancy Toll (HOT) lanes. The first time this proposal came up, Arlington County stopped it with a lawsuit. But Arlington seems receptive this time. What's different?


Photo by Virginia Department of Transportation on Flickr.

New plan differences

Unlike last time, VDOT has committed to doing an environmental assessment from the start. The agency is also doing a Transportation Demand Management (TDM) study to "identify transit, carpool, vanpool and other demand strategies that can improve travel along the corridor."

The proposal includes "guaranteed funding" for new and enhanced transit service and carpooling incentives, though the amount of funding is still under negotiation. Unlike the prior plan, it leaves the Shirlington Circle interchange as-is and would keep the currently under-construction Seminary Road access ramp restricted to HOV use.

Questions remain about design, transit, and bicycle accommodations

Despite the changes to the proposal, Virginia transporation officials still need to answer many of the questions and concerns raised last time around and work to mitigate any potential negative impacts from the HOT lanes.

While the proposal adds capacity with a third lane, it also allows cars with fewer than three occupants, meaning additional traffic. Will this speed up or slow down the existing HOV and bus traffic? Slowing down HOV traffic would lessen the incentive to carpool. And slowing down buses would lessen the incentive to use public transit, as well as raising the operating and capital costs for local transit agencies.

One of those agencies, the Potomac and Rappahannock Transportation Commission, lost $1.5 million in federal funding when the 95 HOT lanes opened. What impact will the conversion have on transit funding for other local transit agencies?

There are other significant issues with safety, accommodating travelers without cars, and working the plan in with other transportation plans in the area.

VDOT claims that construction will not require taking of any residential properties or significant rights-of-way. Other than the construction of new sound walls, officials believe they can fit the third lane into the existing footprint of the HOV lanes. But that could require making the shoulders narrower or even removing them, which could impact safety, access for emergency vehicles, and the reliability of travel times.

It seems like every major highway expansion, from the 495 HOT lanes to the Intercounty Connector includes a major transit element, and yet they rarely seem to materialize or are quickly phased out. It's unknown how much money this plan guarantees for transit and TDM and who will determine how it is spent.

Likewise, the plan misses an opportunity to add to Northern Virginia's trail network, like the existing Custis Trail proposed trails along I-66. And it's unclear whether the plan will do anything to mitigate tree loss, which was a major issue with the I-95 Express lanes.

Virginia learned a tough lesson with the existing 95 HOT lanes: Eventually all HOT lanes have to end, and the merge situation when they do can create major backups. The 395 HOT lane extension would end at or near the already-congested 14th Street Bridge. How will VDOT avoid exacerbating an already ugly situation there and can they coordinate with DC's slow-moving initiative to add a network of HOT lanes within DC, including on the 14th Street Bridge?

The way the contract is written gives Virginia an incentive to discourage carpooling in the HOT lanes. The 395 HOT lanes will be governed by the existing contract the commonwealth has with Fluor-Transurban which requires Virginia to reimburse the firm if the facility carries "too many" HOV users.

I-395 and I-66 are very different

Comparisons between the plans for I-66 inside the beltway and I-395 HOT lane plans are easy to make; both would convert existing HOV lanes into HOT lanes and both would provide funding for transit. Beyond that, however, they differ quite significantly.

I-395 has, and would continue to have un-tolled, unrestricted lanes in addition to the HOT lanes. I-66 would consist of only HOT lanes. The I-395 HOT lanes would charge tolls at all times; the I-66 lanes would only charge during rush hour, and only in the peak direction.

The I-395 HOV lanes are already HOV-3 only; the I-66 lanes are HOV-2. The I-395 HOT lanes will be paid for by a private partner; the I-66 HOT lanes will be paid for by Virginia.

The cumulative effect of the differences in cost, alternatives options and existing HOV level shift the conversation being had about effectiveness and impact on surrounding jurisdictions enough that support or opposition for one doesn't necessarily translate into similar feelings on the other.

The plan is more predictable and it gives the local governments a say

The changes in the latest HOT lanes proposal appear tailor-made to reduce push-back and ease approval by making the effects of the proposal easier to predict and understand. It requires almost no land acquisition, changes the existing highway interchanges as little as possible, uses an existing vendor under an existing contract, commits to funding transit and TDM, and will include an environmental process from the outset.

The environmental process ensures that the public and the jurisdictions will have the leverage they need to ensure their questions get answered. Until they are, however, we can't know whether this proposal will help or harm. If Arlington sues again, or some other jurisdiction does, it likely won't be because they can't get their questions answered, it will be because they don't like the answers.

What question do you have? What should the public and jurisdictions be certain of before deciding whether to move forward with HOT lanes on 395?

Roads


I-66 widening will happen soon whether it makes sense or not

Virginia Governor McAuliffe announced today that I-66 will become one lane wider eastbound inside the Beltway, from the Dulles Toll Road to Ballston. That changes previous plans to hold off on widening, to give transit and tolls a chance to ease congestion on their own.


Could only HOT lanes combined with transit and multimodal options have eased congestion on I-66? We'll never know. Photo by Virginia Department of Transportation on Flickr.

Until today, the plan was to allow single-occupancy vehicles to use I-66 in exchange for paying a toll, and to dedicate the toll revenue to transit and demand management. Then VDOT would study whether or not it was still necessary to widen the road.

However, Republican leaders in the Virginia General Assembly filed legislation to block that plan, and widen immediately instead.

The new compromise plan will immediately move forward with widening I-66 eastbound from the Dulles Toll Road to Fairfax Drive in Ballston. In exchange, Republican leaders will drop their opposition to the tolls and transit components.

One more compromise

McAullife's original tolling proposal had already been significantly compromised. His original plan called for tolls in both the peak and non-peak directions, and an immediate switch to HOV-3. Those proposals were axed months ago to appease Republican lawmakers outside the beltway.

What was theoretically finalized in late 2015 was converting the existing peak-direction HOV-2 lanes to HOT-2, an agreement to spend the majority of toll revenue on transit projects in the corridor, eliminating exemptions for hybrid cars, Dulles Airport traffic, and law-enforcement cars so that all single-driver cars had to pay the toll, and an agreement that Virginia would not widen I-66 without first studying the effects of the tolls and transit.

It's that final part, the agreement not to widen, that's now changing. The remainder of the 2015 deal, including tolling, dedicating most revenue to transit, and eliminating the various HOV exemptions, will continue.

Tolling is still expected to start in 2017, the same as the original timeline. It will take longer to build the new lane, but not much longer. The widening will likely be complete by late 2019, just prior to a planned sister project outside the beltway. The HOV-2 provisions will become HOV-3 both inside and outside the beltway in or around 2020.

The widening inside the beltway will cost $140 million.

This is a loss for Arlington, but there are silver linings

This new compromise is a blow to Arlington, which has long supported investments like transit, cycling, and transportation demand management as alternatives to widening I-66. It is also a blow to Virginia's move toward a more data-driven transportation decision-making process, as the lawmakers pushing for widening ignore data saying it's not necessary.

While Smart Growth advocates never like to see highways gets wider, there are some bright points in even this compromised proposal.

While induced demand causes most widened highways to fill back up with traffic quickly, I-66's tolls will adjust in price according to the level of congestion, which should fight that tendency. The widening will also require a thorough environmental review, giving the community a chance to discuss impacts to parks, trails, water quality, and more.

Crucial to the compromise is the fact that the majority of toll revenue will still be dedicated to transit and other multimodal improvements, and that HOV exemptions that currently make it easy for single-occupant cars to skirt the rules will be eliminated.

That said, serious concerns remain. The governor has stated that the $140 million is not being taken from any other project, but money doesn't just appear. Even if it hadn't been allocated to another project yet, it would have been eventually. What are we not getting because we're spending $140 million widening I-66?

McAuliffe's plan has been watered down several times already. Will Virginia stick to its guns now? Or will toll revenue eventually be stripped from transit? Will the planned move from HOT-2 to HOT-3 never materialize? Will tolls really follow the formula to rise with with traffic, or will political wrangling make tolls too cheap to be effective?

What do you think of the compromise? Is it better or worse than the status quo?

Pedestrians


If students were cars, schools would have opened sooner

Many of the region's schools closed for a full week after the recent blizzard, leaving parents to scramble for childcare and students missing out on valuable classroom time. That's what happens when your storm recovery efforts prioritize making it easy to drive rather than giving everyone a safe way to move around.


Photo by Fionnuala Quinn on Twitter.

The historic storm hit the DC area on Friday, January 22nd. By the time the last flakes fell on Saturday night, just about everything was covered in over two feet of powdery, slippery, transportation-crippling snow.

It was soon pretty easy to drive, but not get around by any other means

As crews throughout the region got to work on their respective snow clearing plans (impressive work for which they deserve a lot of thanks), roads became passable and then completely clear. In contrast, sidewalks, curb cuts, and bus stops were often blocked not just by snow, but also frozen slush.

Some of the area's bike trails were cleared, but access points were plowed in, and the network as a whole was not rideable. Metro returned to service, but getting to stations was a dirty, icy, boulder-climbing adventure and plowed-in bus stops left people waiting often in very busy streets.

Without good options, the only choice left for most people was to drive, clogging our already strained roadways that the remaining snow had narrowed.

As the week wore on and roads became clear, adults returned to work. But faced with the conditions that would have left children walking and waiting for buses in the streets, school officials decided there were not enough safe routes to school, and kept most of the region's schools closed for the entire week.


DC's 5th and Sheridan NW, the Tuesday after the storm. To the right on 5th (the street going left to right) is Coolidge High School. To the left is Whittier Education Campus. Photo by Julie Lawson.

This didn't happen randomly. Arlington is an example of why.

These conditions were a result the fact that our systems for clearing snow focus first on getting cars moving again. People walking and biking are, at best, an afterthought in the region's snow clearing plans.

For example, Arlington posts a clearly thought-out snow operations plan on their snow operations web page:

  • Phase I: During the storm, county crews keep the arterial and collector roads as functional as possible to make sure that emergency access like EMS, fire, police, utility trucks etc. could still get through.
  • Phase 2: Immediately after the storm, they keep working those major corridors, widening lanes so everybody else could start driving again, too.
  • Phase 3: When those are under control they start working their way into residential streets.
Arlington has no unified public plan for clearing the rest of the transportation network - the sidewalks, trails, curb cuts and bus stops that are necessary for people walking, biking and taking transit.

Private individuals are responsible for clearing the majority of sidewalks, and various agencies of the County government are responsible for some routes. Apparently, there are designated "safe routes to schools" that are meant to get priority in snow clearing, but those routes are not made public and are not given priority if the schools are closed. However, many stretches are left without anyone to clear them, unless the County chooses to on an ad-hoc, complaint-based basis.

For example, the stretch of sidewalk along Lynn Street between the intersection of Lee Highway and the Key Bridge is along National Park Service Property. After this storm it took more than a week before the snow and ice were clear along this stretch, which cut off the main sidewalk access between Rosslyn and DC.


Arlington's "Intersection of Doom," at Lee Highway and N Lynn Street, just south of the Key Bridge. People walking and biking would need to climb over this snow/ice mound to get to the iced over sidewalk that leads to Key Bridge. Photo by the author.

When this snow plan was implemented, the streets were cleared, but the sidewalks and bus stops students would have needed to get to school were covered, often in mounds of snow deposited by snow plows. Instead of forcing kids to walk or wait for buses in the street, officials closed most of the region's schools for the entire week after the snow storm, forcing students to lose valuable instructional time at the end of the grading period.

Meanwhile, the region began to get back to work. By Wednesday, after three full days of being closed to allow the region to focus on digging out, most business were open and workers were working.

There are other ways to do this

During and immediately after the late winter blizzard of 1996 that dumped about the same amount of snow as last week's storm, New York City shut down all streets in Manhattan to private cars. The only vehicles on the roads were emergency equipment, garbage trucks, transit vehicles and of course snow plows.

NYC-DOT knew it could never get the city up and running again quickly if they decided that their first priority was to make it possible for everybody to drive their cars again. Roads were opened to traffic only after the sidewalks and bus stops were clear. In New York this took two days.

Arlington could do the same thing: Clear just enough of the roadway to accommodate emergency and service vehicles and eventually transit, but not more. With virtually no cars on the roads, people could at least get around on foot without putting their lives in danger.

And because transit and school bus stops would be cleared and almost no traffic on the road, these buses could actually get through and run on normal schedules. All kids, walkers and bus riders alike, would have a safe way to get to school.

Arlington does transportation well… when it doesn't snow

Fortunately, a good model exists right under our own noses. Arlington's transportation program looks at mobility as a public right, and sees all modes as legitimate. This includes mobility for people in cars, but doesn't leave out people on bikes, people on transit and people on foot.

Arlington's snow operations planners should try looking at mobility the same way when they plan for snow removal.

In this storm we saw a snow removal plan focused on getting cars back on the road. That happened by Wednesday. But cars don't occupy desks at schools.


After snow storms, it'd be smart to prioritize getting schools up and running. Photo by Arlington County on Flickr.

Our public schools closed for a week because there wasn't a safe way for kids to get to them. We need a transportation system that serves the students, whether they drive, ride the bus, walk or bike to school.

We didn't have that after the recent blizzard, so we didn't have school.

Roads


Use this map to share your ideas for better east-west travel across DC

Is it frustrating to try to travel from Columbia Heights to Brookland on foot, bike, bus, or car? The District Department of Transportation is studying ways to make it easier to travel east-west in this area, and a new interactive map lets you point out problems.


Map by DDOT. map. Click for an interactive version.

This WikiMap is part of DDOT's Crosstown Multimodal Transportation Study, the goal of which is to improve all modes of travel between 16th Street NW and South Dakota Avenue NE. It lets users identify problems with and suggest solutions for
walking, riding a bike, driving, transit, public space, parking, and intersections, and is a user-friendly way to participate in DDOT's search for long-term solutions.

People who frequently commute by foot, bike, bus, car, or other means through the corridor have firsthand knowledge on the area's congestion, safety, and streetscape issues. They're also likely to have ideas on how these issues can be addressed to improve transportation mobility and mitigate impacts on the surrounding neighborhoods.

Beyond the crowdsourced map, DDOT recently kicked off the first in a series of public meetings for the project aimed at gathering feedback.


A map of the study area.

The interactive map will be available on DDOT's website (just click the first image in this post) for several months.

Roads


Reston wants urban street grids around future Metro stations

Fairfax County wants to make it easier to walk, bike, and drive in Reston, especially to current and planned Silver Line stations. A new street grid and three ways to cross the Dulles Toll Road are part of the plan to make that happen.


Image from Fairfax County

The county's Department of Transportation recently kicked off the Reston Network Analysis, which is focused on finalizing the grid of streets necessary to support the coming development around three new Metro stations in Reston.

Ideas for near the stations include new bike lanes, adjusted traffic signals, and re-striped roads, as well as realigned or wider roads. It's also possible that Fairfax will build new roads in these areas.


Proposed bike facilities in Reston. Image from Fairfax County.

One of the Reston-wide improvements is the Soapstone Drive Overpass , which will provide another connection across the Dulles Toll Road and a new way to get to the Wiehle-Reston East station.

There will also be a Town Center Parkway Underpass to provide an additional connection across the Dulles Toll Road to help relieve Fairfax County Parkway and Reston Parkway. It will also provide a direct connection from the transit-oriented developments to the north and south of the Reston Town Center station.

A November presentation also mentioned a South Lakes Drive Overpass. The connection would be similar to the Soapstone over pass, allowing for pedestrian, bikes, single-occupancy-vehicles and busses to cross the Dulles Toll Road without using Wiehle Avenue or Hunter Mill Road.


The Reston Transportation Study Area. Image from Fairfax County.

The study will also look at ways to improve four specific areas: Reston Parkway from Lawyers Road to Baron Cameron Avenue; Fairfax County Parkway at Spring Street; Fairfax County Parkway at Sunrise Valley Drive; and Rock Hill Bridge, which connects Loudoun County and Fairfax County over the Dulles Toll Road.

These areas are under consideration because they are important parts of Reston's transportation network and are currently over capacity or will be after the redevelopment around the Metro stations occurs. The study will also look at how to make it easier to bike and walk in these areas.

The Hunter Mill Supervisor has appointed the Reston Network Analysis Advisory Group to help staff develop and test ways to make the street grids better.

In 2015, the Fairfax Department of Transportation presented a report that summarized existing conditions by looking at traffic counts from mid-2015. Among the key findings in the report:

  1. During evening commutes, the intersection of Wiehle and Sunset Hills rates an "F" for level of service
  2. The planned grid of streets will make pedestrian access and mobility near transit stations better
  3. The report also published baseline vehicle volume levels near current and future Silver Line stations
For future trips that come from more density around the coming Metro stations, the goal is to cut vehicle trips within a quarter mile of the stations by 45%.

Members of the public can learn about and comment on the project at a meeting on Monday, February 1 from 7-9 pm at Lake Anne Elementary School, which is at 11510 North Shore Drive in Reston. You can also contact project manager Kristin Calkins at Kristin.Calkins@fairfaxcounty.gov.

Roads


How snow exacerbates the weaknesses of suburban road design

A lot of people had awful commutes Wednesday night, thanks to snow. And a lot of people had fine ones. One explanation for the difference: Suburban roads are far more susceptible to catastrophic breakdown than urban street grids.


Traffic congestion on Wednesday night. Image by Brendan Casey from Google Maps.

Snowstorms like Wednesday's highlight how easy it is to completely shut down suburban-style transportation systems. And conversely, how comparatively resilient are more urban systems.

Cities beat suburban areas on snow resiliency in two big ways: Multimodalism and network connectivity.

First and foremost, with transit, walking, and biking more convenient options, cities are simply much less reliant on having clear roads. Metrorail worked like a dream yesterday, and pedestrians had a lovely commute.

It simply didn't matter how bad the roads got for a significant percentage of DC's travelers, because they simply weren't on the roads while they traveled.

Don't put all your eggs in one basket

But that's not all. Even for car drivers, urban street grids are more resilient than road systems focused around large highways, because of how they're laid out.

The great thing about interconnected grids is that if one street becomes blocked, there's another perfectly good street one block over. And another one block down.

If a wrecked car or fallen tree or whatever blocks the street you're on, you just take a different street. There might be some additional turns involved; it might not be quite as direct. But for the most part 28th Street isn't all the different from 29th Street.

Contrast that with suburban-style systems where all traffic in a particular area funnels onto one big highway. If that one highway becomes impassible, everyone in the area is stuck. Or, at best, they have to drive miles out of their way to find the next big highway.

This illustration shows how that works. If the "Collector Road" gets jammed, people in the top half of the image can still move around. People on the bottom half can't.


Suburban-style roads vs urban street grid. Image from USDOT.

That's part of what happened last night. There were a lot of accidents crashes. If they happened on arterial highways with no parallel roads, which a lot of them did, that road would succumb to gridlock.

Urban places aren't immune, but they're better off

To be sure, this storm was bad for roads all over the region.

Streets in Northwest DC were just as dangerous as those elsewhere, and DC's plowing response was bad. And buses were every bit as stuck in it as cars.

But there's no doubt that people who could travel via Metro or foot had a much better time, and there's no doubt that drivers who could use parallel streets were able to bypass some of the congestion on arterials.

Cross-posted at BeyondDC.

Roads


In rural Maryland, a saint watches over drivers

Traffic heading north on I-95 out of DC can test even the most patient traveler. The next time you're headed to Philadelphia, New York, or Boston, you might want to say a little prayer to Our Lady of the Highways, a roadside memorial in Childs, Maryland, north of Baltimore.


Photo by cranberries on Flickr.

You'll find Our Lady of the Highways on I-95 northbound in Cecil County between exits 100 and 109, near the underpass for Blue Ball Road. On a foggy night in October 1968, there was a horrific 17-car crash at this spot, which killed three people. The Oblates, a group of priests, erected the statue in 1968 (and replaced it in 1986) to commemorate the tragedy and encourage other drivers to be more careful.

Our Lady of the Highways isn't the only transportation-oriented saint. There are also patron saints for cycling, air travelers, and motorcyclists, among others.

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