How much space should a CMV driver allow when passing a cyclist or pedestrian?

PASSING VULNERABLE ROAD USERS (cyclists, pedestrians, motorcyclists) requires more care than passing other CMVs. CMV-SPECIFIC HAZARDS: Extended mirrors can extend 2-3 feet from the cab on a tractor — a CDL driver who is '3 feet from the curb' may still have a mirror within 1 foot of a cyclist; the visual judgment required is significantly harder in a CMV than in a passenger car; the pressure wave from a passing CMV at speed can literally blow a cyclist off course; accidental mirror strikes with cyclists are a known cause of serious injury and death. 3-FOOT RULE: Most states now have a '3-foot rule' requiring at least 3 feet of clearance when passing cyclists. Some states require 4-6 feet or simply a 'safe distance.' CDL drivers should know their state's requirement. PRACTICAL TECHNIQUE: (1) Increase clearance where possible — if road allows, swing wider; (2) Reduce speed — the pressure wave effect is significantly worse at higher speeds; (3) Tap horn gently to warn the cyclist well in advance (100+ feet before reaching them, not suddenly); (4) Check mirrors AFTER passing to confirm the cyclist wasn't affected; (5) Never pass a cyclist at high speed in a narrow lane if safe passage isn't possible — slow down and wait for a safe opportunity. BRIDGES AND TUNNELS: Particularly dangerous — the confined structure amplifies the air pressure wave and leaves no room for lateral error.