A driver is operating a loaded combination vehicle on an undivided highway during freezing drizzle with an ambient temperature of (). While traveling at 45 mph, the driver notices that water spray from the preceding vehicle's rear tires has abruptly stopped, and a glossy sheen is visible on the surface of an approaching river bridge. Which set of actions should the driver immediately take to maintain directional control and reduce the risk of a jackknife?
- AEngage the engine retarder to maximum power to slow the vehicle gradually without applying the foot brake.
- Turn off the engine retarder, gently ease off the accelerator without abrupt braking, and increase following distance.Answer
- CClose following distance behind the lead vehicle to utilize its melted tire tracks for enhanced traction across the bridge.
- DMaintain 45 mph until entering the bridge structure, then apply firm, continuous service brake pressure to scrub off speed rapidly.
Answer
Turn off the engine retarder, gently ease off the accelerator without abrupt braking, and increase following distance.
When road spray from other vehicles ceases despite the roadway appearing wet, it indicates that water has frozen into black ice. Because bridge decks freeze before other roadway segments, the driver must immediately turn off any auxiliary retarders to prevent drive-axle skids, smoothly reduce speed by easing off the throttle without aggressive braking, and significantly expand following distance.
Step-by-Step Solution
Key Concept
Managing vehicle controls and recognition of black ice on bridges during freezing precipitation
Estimated Time:1m 30s