While operating a commercial combination vehicle on a divided highway with a posted speed limit of , you encounter heavy rainfall that leaves standing water across the roadway. Which action should you take to safely manage vehicle speed and traction?
- AReduce travel speed to while engaging the maximum engine retarder setting to maintain steady driveline resistance.
- Reduce travel speed to approximately (about one-third reduction) and turn off the engine retarder.Answer
- CMaintain the posted speed of until hydroplaning occurs, then apply firm, continuous service brake pressure to regain steering control.
- DMaintain cruising speed on straight sections and brake aggressively right as the vehicle enters deeper standing water in curves.
Answer
Reduce travel speed to approximately (about one-third reduction) and turn off the engine retarder.
According to official CDL safety principles, drivers must reduce vehicle speed by approximately one-third on wet pavement (e.g., from to ) to counteract increased stopping distance and avoid hydroplaning. Additionally, engine retarders must always be switched off whenever traction is compromised by wet, snowy, or icy road conditions to prevent the drive wheels from breaking traction and causing a skid.
Step-by-Step Solution
Key Concept
Wet pavement speed reduction guidelines and retarder disengagement
Estimated Time:1m 0s