I'd just as soon see an extra general lane, and keep one lane as ETL. Building a second ETL is ridiculous, based on usage in other places. Provide SOME relief for people; the 405 is one of the worst bottlenecks in Seattle!
Sorry for the late reply and bump. I always forget to check the Regional boards.I definitely agree with you to an extent. I'm okay with the second HOT lane between Bellevue and Bothell. Adding another GP lane there might get a lane (maybe two?) on the left to be a little more free-flowing, but you'd still have stop and go traffic on the right with all the weaving. Also, if you get the left GP lane *too* free-flowing, HOV traffic will use it for passing, which can be dangerous.
But a 2 HOT/2 GP setup between Renton and Bellevue is frickin ridiculous. I haven't figured out why, but during the morning rush, SB 405 likes to back up around exits 6 and 7,
but the HOV lane is still completely free-flowing. Not the case for the north half. Definitely need a third GP lane on the southern half long before a second HOT lane.
I'm also curious if there are any related plans regarding bus stops. When they rebuilt 520 between the bridge and 405, the bus stops moved from the outside to the median. Are there any plans to do the same here? Sound Transit 560 (from Seatac Airport to Bellevue) right now gets off 405 at Exit 2 to serve Renton, gets back on at Exit 5, then has to serve outside bus stops at Exits 7 and 9, then gets off , so it can't really use the HOV lanes anyway. (The other two Sound Transit routes both bypass the freeway stops -- the 567 also bypasses Renton -- so they could, but all the Metro commuter routes serve the stops at Exits 7 and 9.) If they're not going to build new median bus stops (and i can't imagine there would be room to), that's another good reason to build another general purpose lane instead of a HOT lane, since transit can't use it anyway.