Turn signal (any road)100 feet before
Lane change signal100 feet before
Following distance2x vehicle length
Following — bad weather4+ seconds
School bus — same directionAlways stop
No passing near intersection / RRNever
No passing near bridge/tunnelNever
Dim headlights (oncoming)500 feet
Dim headlights (following)300 feet
Brake lights visible from100 feet
Loaded truck @ 55 mph stopping450 feet
Pass bicyclist (1-lane each way)3 feet minimum
RR crossing stop range15–50 feet from rail
Tire tread minimum2/32 inch
💡 Washington following rule: leave at least twice your vehicle's length between you and the car ahead (Section 5.2). Use the 2-second rule with a fixed point. Increase to 4+ seconds in rain, snow, fog, or behind motorcycles.