A commercial driver is operating a tractor-trailer on a highway with a posted speed limit of as steady rain makes the road surface completely wet. According to commercial driver licensing guidelines for speed management and vehicle control on wet surfaces, which combination of speed adjustment and auxiliary control is correct for these conditions?
- AMaintain the posted speed of and delay all speed adjustments until entering curves or turns along the route.
- Reduce speed by one-third to approximately and turn off the engine retarder.Cevap
- CReduce speed by one-third to approximately and engage the engine retarder at maximum capacity to shorten stopping distance.
- DMaintain while solely extending following distance to account for mechanical braking distance.
Cevap
Reduce speed by one-third to approximately and turn off the engine retarder.
According to official commercial driving safety standards, operating on wet pavement requires slowing down by approximately one-third of the normal speed limit (reducing by down to ) and completely disabling auxiliary engine retarders to prevent dangerous drive-wheel skidding.
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Anahtar Kavram
Speed reduction by one-third on wet surfaces and retarder deactivation in slippery conditions
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