From a cameraphone, but it still clearly told the tale of a dangerous spot in The Junction – which may see extra traffic during West Seattle Summer Fest this weekend – the photo came from Jim Edwards, as did this report:

You know the sign that says “motorcycles use extreme caution” — you better heed it here. Just north of Alaska on 42nd Ave SW. Part of the Capco site work. It is wide enough to catch a scooter or motorcycle tire. A bicycle will flip for sure. SPD non-emergency notified about quarter past nine. This is the detour route for the weekend too.

As mentioned here in a related context recently, if there is a major road hazard, the city also advises alerting 206-386-1218. UPDATE: Jim just called and was told the plate’s “already been reset.” Still – be careful in this spot.