A semi truck heading westbound on State Route 18 caught fire and its trailer was fully engulfed in flames at around 11:30 a.m. on Saturday morning.
Puget Sound Fire said the flames also extended into the brush on the side of the highway near 236th Avenue Southeast in Maple Valley.
It took about 30 minutes to extinguish the fire, and traffic was backed up for hours as crews worked to clear the debris…