The Seattle
Times March 23rd B1 page Traffic Lab article, “Lynnwood light rail
could be a budget beneficiary” is hardly the good news suggested by the
article. Even with the federal
grant local tax payers will be required to pay close to $2B of the $3.1B
extension that will do absolutely nothing to increase transit capacity into
Seattle. Neither Sound Transit,
nor apparently the Seattle Times Traffic Lab, recognizes routing Central Link through the Downtown Seattle Transit Tunnel (DSTT) severely limits
its capacity.
A 2004 PSRC Technical
Workbook, “Central Puget Sound Region High Capacity Transit Corridor
Assessment” concluded the DSTT station lengths limit trains to four cars and
that safe operation requires a minimum of 4 minutes between trains, or 60 light
rail cars per hour. The PSRC Technical Workbook also concluded the
capacity of the 74-seat light rail cars was limited to 148 riders for a total
capacity through the tunnel from Everett into Seattle of 8880 riders per hour
(rph); a fraction of the transit capacity required to reduce congestion.
Sound
Transit initially sold light rail as a link between UW and Tukwila with an
early extension to SeaTac. At the
time they projected 70,000 of the projected 110,000 riders would come from the University
Link. A University T/C would
provide an interface between 520 BRT and light rail, benefitting commuters from
both sides of the lake. It included a 2nd Montlake Cut Bridge to
facilitate BRT service.
Terminating BRT routes at the UW would have allowed light rail to
eliminate most if not all of the 520 bus routes into Seattle with the return
routes providing Seattleites with light rail/BRT connections to Microsoft and
Bellevue.
Instead
Sound Transit used purported UW objections to eliminate the T/C at the UW
stadium parking lot, the 2nd Montlake Cut Bridge, and extend light
rail to Northgate. They plan to
spend $2.1B on the extension they’ve claimed would attract 15,000 daily riders,
a fraction of what the UW T/C would have provided. Especially since large numbers of commuters would use T/C
BRT connections in both directions.
Sound
Transit’s 2017 4th Quarter weekday average boardings at UW and
Capitol Hill totaled 17,487 with most presumably morning commuters into Seattle
to Westlake or University Stations in DSTT. Assuming half of the 15,000 Northgate Extension riders were
also commuting into those stations in Seattle (again very few will likely commute to
Northgate in the morning) gives a total of nearly 25,000 every morning. Accommodating their projected ridership
into the DSTT with the Northgate Link and PSRC 8880 rph capacity will take
nearly three hours.
Surely Sound
Transit’s decision to spend $3.1 B extending light rail beyond Northgate to
Lynnwood is absurd. Yet the
Traffic Lab article gives credence to Sound Transit claim the extension will
add 68,500 daily riders, presumably adding 34,250 commuters into Seattle every
morning. (They fail to mention the additional 37,000 riders Sound Transit claims they'll get from the billions spent on Everett extension.)
The Seattle
Times describes Traffic Lab as a “project that digs into the regions thorny
transportation issues”. It doesn’t
take much “digging” to recognize it will take nearly 4 hours for light rail to
accommodate just the Lynnwood Link riders every morning. Most would consider that a “thorny transportation issue”
worthy of mention in article.