2:03 PM: Don’t know yet how long this will last – but heads up if you are heading north: The Alaskan Way Viaduct might be a trouble spot for a while, because the collision shown in SDOT’s tweet has closed the northbound Battery Street Tunnel. No Seattle Fire callout, which likely means no serious injuries, if any. Updates when we get them.

2:20 PM: The Incident Response Team is on scene, says SDOT.

2:42 PM: Open again.