WSP troopers collect at two places near this interchange and tag team writing tickets. Southwestbound traffic should watch for troopers both under overpass immediately west of the exit and also for troopers at the top of next hill. Northeastbound traffic should watch for troopers again at the same underpass immediately before the exit and then also for troopers waiting on the on-ramp that runs parallel to SR-18 as it crosses Issaquah-Hobart Road.

Enforcement in this area is frequent during high travel times for this corridor (i.e. weekends leading up to Memorial Day, weekends before and after WSU goes on Spring Break).