by ROSS BLEAKNEY
[This seems a good a time as any to remind everyone that guest posts do not necessarily reflect the views of STB staff or the editorial board – Ed.]
What exactly is Bus Rapid Transit (or BRT)? Perhaps, like the Supreme Court said about “pornography”, you know it when you see it. If the Wikipedia definition of BRT is any guide, I haven’t seen it in Seattle. To quote their definition, “To be considered BRT, buses should operate for a significant part of their journey within a fully dedicated right of way (busway) to avoid traffic congestion”. RapidRide is not BRT, falling well short by ITDP standards.
But we can certainly build a real BRT system for West Seattle that has almost every advantage of what we call “light rail” (mostly grade separated, off-board fare collection, station platforms level with the bus floor, priority at intersections, etc.). Unlike the light rail concepts being offered by Sound Transit, BRT to West Seattle would allow riders from all the key corridors of West Seattle (California, Fauntleroy, 35th, Admiral/Alki and Delridge) to enjoy a fast and frequent ride to downtown without having to transfer.
The Challenges of Serving West Seattle with Transit
West Seattle is a fairly large area, separated from the rest of Seattle by the Duwamish River. If you look at a census map of West Seattle, there are a few pockets of scattered density, but nothing over 25,000 people per square mile. The more densely populated areas are not in a line, either, making it all but impossible to connect the area with one rail line. A light rail line that serves the Junction is likely to miss Admiral, Alki and the Delridge corridor. A rail line on Delridge would miss Admiral, Alki, California, Fauntleroy and 35th.
Link to West Seattle would be expensive. It would have to traverse low-ridership Sodo and Harbor Island, cross water and rugged terrain. Martin Duke estimated the cost of getting to the junction at $2 – 2.5 billion, not including a downtown tunnel.
The city is unlikely to build parking around the stations, meaning that most riders would walk to the station or arrive by bus. A comparison of population density and the proposed set of stations shows that no set of West Seattle stations will be within walking distance of a majority of potential riders. For light rail to be successful, a vast majority of riders would have to arrive to the station by bus.
Transferring from to bus to train incurs a transfer penalty: exiting the bus, walking to the station, getting to the platform, and waiting for a train (Sound Transit suggests headways of ten minutes). In most of Seattle, the train makes up for that penalty by using its dedicated right of way to outrun buses mired on surface streets. In West Seattle, however, there is easy access to a high-speed freeway if agencies execute several relatively low-cost infrastructure projects. For most riders on West Seattle’s major bus corridors, this would result in a faster trip to and through downtown than with light rail.

















