The cost of HOV-2 on I-405


Any regular transit rider coming home from Bellevue, in a bus, in an HOV lane on I-405 southbound, knows well the feeling of moving 0-5 mph. Granted, it’s not always like this. There are certainly some days where it zips by traffic at nearly 60, while some other days it takes over 20 minutes just to get to I-90.

While unreliable HOV travel times are already quite frustrating, very often traffic flow in the HOV lane ends up being as bad or worse than in the general purpose lanes! Why is this tolerated by WSDOT, when the whole point of an HOV lane is to flow faster as an incentive for people to carpool or take transit? Why would anyone want to do this if they are just going to get stuck in the same traffic as if they drove alone?

I-405 south of Bellevue is getting the same type of express-toll lanes as to the north, but not until 2024. You would think that making the current HOV lanes HOV3+ would be a natural precursor to the eventual ETL extension, but WSDOT would not agree.

But how many service hours might be saved if HOV3+ were in place on I-405, in particular from Renton to Bellevue? In this calculation, I’ll assume that traffic in the HOV3+ lanes always moves at 45 miles per hour or better. That is the standard which WSDOT attempts to maintain for the express-toll lanes generally, and is also the point at which WSDOT says it will consider upgrading HOV2+ lanes to HOV3+ (though clearly that doesn’t seem to mean anything in practice).

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