11:48 PM: The emergency response that is backing up southbound Alaskan Way Viaduct traffic right now involves a C Line bus driver, according to Jon, who e-mailed us right after someone else texted about the traffic situation. He says his wife was on the bus and reported that the driver had a medical emergency, possibly a heart attack, right after the bus got onto the Viaduct from Columbia. The call is on the SFD log as a “med 7 response” (major medical situation) but there’s been no official information yet. If you are headed this way, avoid SB 99 for now.
12:06 AM: Still nothing official on this, not even a traffic alert, and nothing on the scanner, so we are not likely to be able to get followup information until tomorrow. The closest traffic cam shows traffic moving, slowly, southbound just north of the scene, with police-car lights visible.
12:38 AM: That traffic cam shows the emergency response has cleared, as has traffic.
FRIDAY, 3:30 PM: Metro reports that the driver died, and that passengers took heroic action both to try to save him, and to get the bus under control. Here’s their news release.