New transit-only sign. (Community Transit)
New transit-only sign. (Community Transit)

Did you happen to see any buses driving on the shoulder this morning? If you did, it wasn’t a figment of your imagination. Community Transit and Sound Transit are now testing out commuter routes in the right-hand shoulder lane of southbound I-405. Two stretches of the highway will be permitted for transit operations during the hours of 6am to 9am on weekdays.

The agencies have worked with the Washington State Department of Transportation (WSDOT) to allow this as a solution to new restrictions in place from the recently installed High Occupancy Toll (HOT) lanes. WSDOT’s HOT lanes limit access to specified locations to improve traffic flow and ensure that drivers pay their tolls. Double white lines demarcate when crossing lanes is prohibited. At HOT lane access points, lane lines become dashed to allow drivers to enter and exit.

However, one major unintended consequence from this arrangement is that it preempts transit from using large stretches of the lanes and thereby reduces the ‘high occupancy’ aspect of the lanes. Many commuter bus routes jump on and off at the right-hand side of the highway. They need ample distance to weave in and out of lanes. Sound Transit routes 566 and 567 as well as Metro route 952 had suffered from this pitfall for portions of SR-167 since HOT lanes opened on the highway; the double lines were removed last year however.

Southbound I-405 shoulders permitted for transit. (Google Maps)
Southbound I-405 shoulders permitted for transit. (Google Maps)

Some commuter buses will operate on the right-hand shoulder between SR-527 and NE 195th St, and SR-522 and NE 160th St, a stretch of highway that represents approximately 3 miles. Community Transit says that its commuter buses will largely use it for out of service operations. Sound Transit, on the other had, plans to operate routes 532 and 535 in the shoulder when traffic is running well below the posted highway speed. The remainder of the time, buses from both agencies will use the right-hand general purpose lane. Passenger service in the shoulder lane could begin next week.

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1 COMMENT

  1. My impression was that the ST buses in that area didn’t use the HOV lanes anyway because of the closeness of the exits. Implying this is more about avoiding congestion in the GP lanes generally rather than a new issue because of the ETL?

    The Sound Transit corridor study of I-405 BRT has buses running in mixed traffic in some areas at the north end of I-405 because they don’t have all the direct access ramps they’d like to have. So I figured it’s probably current practice for the express buses.

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