Washington State Department of Transportation (WSDOT) has been actively building its next Express Lanes facility on I-405.  The facility is now in testing mode, and travelers will see visible progress.  In implementing the facility, WSDOT is changing some of its policies regarding carpools.  This is a similar change to that of Colorado DOT, who is also opening its next Express Lane facility this year with changed carpool policies.  Of note and as reported,

  • HOV customers must have a “Flex Pass” (switchable transponder) in order to use the lanes for free,
  • Motorcycles must have a motorcycle transponder to use the lanes for free, and
  • There will be differential HOV policies by time of day.  HOV-3+ for peak periods, HOV-2+ for off-peak periods, as outlined here.
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