Texas CDL Communicating with Other Road Users

Commercial vehicles need more space to slow, turn, and change lanes. Signal well before the maneuver, keep the signal operating through the maneuver, and cancel it afterward. Early communication gives surrounding drivers time to react without sudden braking.

Use headlights and required clearance, marker, tail, brake, and turn-signal lamps so others can judge the vehicle's size and movement. Clean dirty lenses during inspections. Use four-way flashers when moving unusually slowly or when an immediate hazard requires warning, while following current law and company procedure.

Sound the horn when it can prevent a conflict, such as when another road user may not see the commercial vehicle. Do not use it to express anger. Near pedestrians, cyclists, animals, and quiet areas, combine a measured warning with reduced speed and readiness to stop.

Check mirrors before signaling, signal before changing speed or position, and recheck the intended path. A long vehicle may need room to complete a right turn, but the signal must not invite another vehicle into the space. Never swing left as a routine setup when it creates an opening on the right.

When stopped on or near the roadway, activate hazard flashers immediately and place required warning devices within the required time and pattern. Placement changes for one-way roads, divided highways, hills, curves, and obstructions. Carry the correct devices and never use flame-producing signals near flammable cargo or leaks.

Before moving, confirm all lamps and the horn work. During driving, communicate every meaningful change in direction or speed, maintain visible lane position, and avoid mixed signals. In an emergency, secure the vehicle, warn traffic, and place devices where approaching drivers can see them before reaching the hazard.