On Independence Day 2003, about 15 mc cops were hanging out on Spokane St viaduct. I have never seen so many people get pulled over.
Same day, on the way home on northbound 99, I saw a guy hanging up a sign near Canlis. It said 'Massive speed trap ahead'. Sure enough about 20+ mc cops were waiting for people, radaring them from the pedestrian overpass. Unbelievably, people kept speeding despite the helpful sign.