Highway 410: Enumclaw → Buckley (4 Miles)

When visibility drops from 1000 ft to 400 ft in rain, your scanning MUST compensate. Look for indirect clues: brake lights glowing through logging truck spray, tire spray patterns showing standing water locations, and headlight reflections off wet road surfaces. On Highway 410, fog near White River Bridge means you can't see the deer - but you CAN see muddy hoof prints crossing the centerline.

Rain changes everything. Heavy rain = standing water at White River Bridge (predict hydroplaning zone). Fog near Mud Mountain Dam Road = deer can't see YOU either (predict sudden wildlife movement). Wet pavement + tractor mud tracks = farm equipment just crossed (predict more tractors). That logging truck ahead? Predict the spray cloud will blind you for 3-5 seconds.

Rain SHRINKS your options dramatically. Can't brake hard (hydroplaning risk). Can't swerve aggressively (wet traction = loss of control). Shoulder may be flooded (no escape route). That's why you must identify options EARLY - before visibility drops to 400 ft. Ask: "If that tractor pulls out NOW, where can I go?"

At 400 ft visibility in heavy rain, you have 4.9 seconds at 55 mph - but wet brakes add 0.5 sec, hydroplaning risk adds mental hesitation, and reduced traction doubles stopping distance. Real available TIME? Maybe 3 seconds. This is why Highway 410 locals slow to 45 mph in rain - buying back the TIME that weather steals.