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Keyword: ‘walk shed’

Transit Walk Sheds and Ridership

August 11th, 2014 11 comments

Metro cares about transit walk sheds because more households accessible to transit by walking translates directly into more ridership.

We’ve been focusing a lot on transit walk sheds lately. We’ve shown that the size of a transit walk shed depends heavily on the roadway network and pedestrian infrastructure, and that these sizes vary dramatically by Metrorail station. We’ve also demonstrated that expanding the walkable area can make hundreds of households walkable to transit.

But why do we care so much about walk sheds? Because larger walk sheds mean more households in the walk shed, and that means ridership. For example, we’d be hard pressed to find many households in Landover’s small walk shed, so it’s no surprise that walk ridership at that station is low. On the other hand, thousands of households are within a reasonable walk to Takoma’s larger walk shed, and walk ridership there is much higher.

In other words, the more people can walk to transit, the more people do walk to transit – and data across Metrorail stations prove it:

Correlation between Households in the half-mile walk shed, and AM Peak ridership, by WMATA Metrorail station entrance

More households in the walkable area around a Metrorail station means higher ridership

Read more…

How Can The Coverage of Transit Walk Sheds Be Increased?

July 1st, 2014 2 comments

Pedestrian infrastructure can cost-effectively increase coverage of transit walk sheds.

The roadway networks of most station areas are mostly unchangeable.  Existing structures on private property create unmovable barriers and  usually prevent new roads from being added to the network.  However, there is still opportunity to add pedestrian facilities that would increase a station’s walk shed in a relatively cost-effective way.

Take the example of Southern Ave Metrorail station.  We previously noted how a large number of customers drive to the station from between one and three miles away.  We discussed several reasons for this tendency to drive to Southern Ave, including the proximity to parks on both sides of the station.  The map below shows the transit walk shed of Southern Ave station.

Current walkshed of Southern Ave station.  The area with the orange dotted border contains over 1,200 households that could be within a half mile of Metrorail if a direct pedestrian connection were built.

Current walkshed of Southern Ave station. The area with the orange dotted border contains over 1,200 households that could be within a half mile of Metrorail if a direct pedestrian connection were built.

 

But what if a pedestrian path could be built to connect the station to the neighborhood to the north?

If a well lit, safe pedestrian path were constructed between the station and the orange-dotted area on the map, it could expand the walkshed to include up to 1,200 additional households in DC.  This new connection would likely increase ridership at Southern Ave. and might even generate enough additional fare revenue to fund the construction of the trail.

Metro’s Office of Planning is currently evaluating the walk sheds of our rail transit stations.  What other opportunities do you see for cost-effectively increasing the walk sheds around Metrorail stations?

What’s a Transit “Walk Shed”?

June 10th, 2014 6 comments

Metro will soon be measuring how much growth happens in places that are walkable to transit. Here’s an in-depth look at how we define “walkable” to Metrorail stations and Metrobus stops.

Quarter-mile walk (by the network) for regional Metrobus stops and Metrorail stations

Areas reachable on foot from regional Metrobus stops and Metrorail stations

Metro’s new Connecting Communities metric will measure annual household growth in our region that occurs within the “transit shed” – the catchment area around transit service that generates walk ridership. And improving walkability can be an incredibly cost-effective way to reduce congestion and increase transit ridership.  Let’s take a closer look at how we defined what’s “walkable to transit.”

How Far is Walkable? First, we defined walking distance as a half-mile from Metrorail, and a quarter-mile from Metrobus, for a number of reasons:

  1. Of all the passengers who walk to Metrorail each morning, the median walking distance is just under a half-mile (0.35 miles, actually).  Riders walk farther to some stations than others, but the systemwide average is just shy of a half-mile.  Since rail riders are on average willing to walk a little under a half-mile today, it is reasonable to use a half-mile as an upper limit for walking in the future. (We don’t have similar survey data on Metrobus – yet.)
  2. The land use within a quarter- and half-mile is where we see the strongest effects on ridership on Metro today. More on this below.
  3. Academic literature supports the half-mile radius from rail transit as no better than any other distance, particularly for the link between households and ridership.
  4. Practically, setting the distance any farther than 0.50 and 0.25 miles increases overlap with other nearby stations and bus stops, which increases computational complexity. Read more…

Walk This Way – Metrorail’s Walkshed Atlas 1.0

March 30th, 2015 15 comments

Station-area walkability is one of the most potent congestion-busting tools in the planner’s bag of tricks. Now we’ve mapped out in detail which stations are living up to their full potential – and where we need to redouble our efforts.

We’ve brought to you information about the power of station area walkability. Not only does better station access give mobility benefits to those who most need it, but it also boosts ridership and revenue and therefore lowers Metrorail’s operating subsidy. That means lower taxes for you and me.

Metro’s Office of Planning is wiring the science of walkability into WMATA’s Key Performance Indicators. We are committed to working with our partner jurisdictions to improving station area access and identifying the near-term and low-cost improvements that have big returns for ridership and revenue. And we have been working diligently to develop a comprehensive geodatabase of walk sheds and the land uses – existing, planned, and proposed – located within them.

Example walk shed, extracted from the Walk Shed Atlas.

We’re also happy to release for the first time a comprehensive atlas of Metrorail walk sheds that includes some of the data that the Office of Planning uses to calculate ridership potential and evaluate investment needs. You’ll notice that each station area has a unique “footprint” and that in almost every case, the walkshed footprint is related to the overall performance of the station (as defined by all-day boardings).

A few notes here: Read more…

What’s the Ideal Size for a Transit Walkshed?

July 8th, 2014 2 comments

Large transit walksheds are great, but how big is big enough?

In other posts, we have described what a transit walkshed is, and how changes can be made to the pedestrian network to increase the walkshed area.  Here, we explore how big is big enough.

The diagram below shows a half-mile circle around a transit station.  If the station were located in a field of grass or on a massive parking lot, the walkable area of the circle would be the circle itself, 100% of the half-mile buffer around the station would be accessible by foot.  Unfortunately, that wouldn’t bode well for transit use, since there wouldn’t be any origins or destinations within that walking distance.

Ideal Walkshed DiagramNow, let’s lay a perfect grid of streets across that half-mile buffer.  The street area is where people can walk, and the remaining area contains houses, shops, mixed-use development, etc.  The resulting walkshed for the station begins to look like a diamond inscribed inside the circle.   The smaller the blocks (the closer the streets are to one another) the more the walkshed resembles a perfect diamond that has a diagonal distance equal to the diameter of the circle.  If you take the area of the diamond and that of the circle and compare them, you find the walkshed (square) covers 63.7% of the circular station area buffer.

So if you have a perfect grid and get 63.7% coverage, how can you get any better?  For one, diagonal streets can increase the coverage: if two diagonal streets were added to the grid, intersecting in the center of the circle at the transit station, the square walkshed would turn into an eight-pointed star, increasing coverage even more, but not by much.

An good example of a walkshed greater than 63.7% is that of the Takoma station.  Featured in a previous post, we recently calculated a 91% coverage for Takoma.

It is difficult to pick an ideal size for a transit walkshed.    A larger percentage could be beneficial, but the additional roadway network needed to expand the coverage beyond 63.7% may result in less area dedicated to potential transit origins and destinations.  (Remember the station in the parking lot?)

What Metrorail stations do you feel have good walkshed coverage?  In  your opinion, where can we improve?

 

 

Walk This Way – Metro’s Planning Office at APTA’s Rail Conference

July 11th, 2016 Comments off

Metro shared its Station Area Investment Plan with the APTA Rail Conference attendees – and met with rave reviews.

I recently had the opportunity to present our Station Area Strategic Investment Plan to the over 1,500 attendees at APTA’s Rail Conference.  Many thanks to APTA’s Sustainability and Urban Design Standards program for footing the bill for this trip to Phoenix. It was 117 degrees there, and tested even my desire for walkable urbanism, but that’s another story entirely.

The presentation highlighted the Office of Planning’s work to quantify the return on investment of station area accessibility improvements, work with local jurisdictions, to prioritize these improvements based on an analytical platform, and identify the appropriate funding mechanisms to get these improvements built.

Read more…

Planning Tool Update Sheds Light on Rail Car Crowding Distribution

May 18th, 2015 19 comments

Latest version of Line Load tool will feature modeled car-crowding numbers.

Many factors influence which car number of a Metrorail train a customer rides.  Infrequent riders may wait for the train near the escalator and board the nearest rail car. Savvier customers may prefer to ensure they are the first to exit at their destination station or have an shorter walk at a transfer station.  Others may board cars based on understanding where seats are more likely to be available.  All of this activity can result in uneven loading of Metrorail cars across a given train, with some rail cars crowded and others near empty.

As we mentioned in 2013, the Office of Planning has an in-house tool that allows planners to estimate how crowded trains are based on origin-destination ridership data. Currently we are in the midst of a few updates, which will include the Silver Line that opened last year.  Another of the new features that we are excited about is a rail car crowding analysis for the system’s most critical segments.  Based on over six months of rail car-crowding data that was collected at selected stations by rail passenger “checkers,” the train-based ridership data will be distributed across the cars so we can estimate what kind of crowding we have by car number, at the peak load points. The following graph illustrates the observed car crowding variations at Gallery Place.

carcrowding

Customers may experience crowded conditions even when the average rail passenger per car (PPC) numbers (PDF) would indicate otherwise. This new feature is an important addition that will help Metro planners better understand the customer experience.  The car crowding analysis will begin to identify which cars of a train tend to be crowded in the peak hours, and which are less crowded.  This information will the be used as a starting point for devising strategies for better spreading customers across all cars of a train.

How do you choose which rail car you ride in?  Other than berthing trains at the center of the platform (see this informative article over at Greater Greater Washington on that topic), what strategies might Metro consider to better balance customers across rail cars?

 

 

A Half-Mile Walk to the Nearest Metrorail Station, Mapped

August 4th, 2014 21 comments

Here’s a map showing the walkable area around the nearest Metrorail station.

eGISBaseLTR_RailPedSheds NonOverlap

Did you ever wonder which Metrorail station is closest? Where’s the breakeven point between two stations? This map shows the areas you can actually reach within a half-mile walk along the roadway network, as we described previously. The twist this time is that I disallowed “overlap” within the GIS network analysis, so land is allotted to the closest station only, calculated by network walk distance.

What do you see in this map?  Here’s a regional view with all stations, as well.

Update 9/2/2014: the GIS source file for this map is now available for download, in geodatabase (.gdb) format.

Prioritizing Bike and Pedestrian Station Access Projects Near Metrorail

November 1st, 2015 Comments off

We all know improving station access is good.  But, how do we rank access projects relative to each other?   Step 1: Ridership

In our recent post, we gave you an overview of our Station Access Investment Strategy project.  We’ve identified 1,000s of recommendations for new pedestrian and bicycle infrastructure near our Metrorail stations and need a way to prioritize them.  After some thought, we’ve come up with a number of potential criteria.  In this post, we’ll discuss those that deal with ridership.

July 2014 Post on Ridership Potential from New Ped./ Bike Projects

Map of the Southern Ave walk shed from July 2014 Post on Ridership Potential from New Ped./ Bike Projects

Once again, one of key concepts we’ve been telling you about in recent months is that by improving access to stations we can grow ridership.  For stations with relatively small walk sheds, we’ll conduct a detailed analysis of what happens to the walk shed when the proposed projects are built.  For example, add a sidewalk at Cheverly and the walk shed will grow by X%.  We will then look at the amount of households and jobs in the newly connected area and, using some methods we’ve shown you in other posts, calculate the potential ridership gained by the new project.  The higher the potential ridership gain, the better the project scores.

But, we also want to understand the value of a new project to a part of the station that is already connected to the network and how this could relate back to ridership.  To do this, we’ve come up some other metrics.  They include: Read more…

Metro Studying Ways to Improve Bike/Ped Access to Stations

October 7th, 2015 Comments off

Improving walk and bike access is a cost effective way to increase ridership and improve the efficiency of the Metrorail network.   Where are these improvements needed and how should we (as a region) prioritize them?

Landover Walkshed

What projects might increase the size of the walk shed of the Landover Metrorail station?

In a number of earlier posts starting last summer, we’ve discussed the concept of walk sheds and explored the relationship between walkability, land use, and Metrorail ridership.  One conclusion of this effort:  grow the size of the walk shed and you’ll grow ridership.

Generally, we only have control over what happens on our own property.  While we have made great strides in identifying and prioritizing bike/ped access improvements on our own property, increasing the size of the walk sheds requires coordination with state or local agencies who own, plan, design and construct roads, sidewalks and pathways near our stations.  We know that in order to have a larger impact on walk and bike access, we need to cast a wider net and identify projects that are up to one mile from our station entrance.  We have created a plan — the Station Access Investment Strategy — to highlight some of these projects as priorities for our local partners to use as they develop their capital improvement plans. Read more…