When is there a particularly high risk of a semi-trailer truck with compressed-air brakes jack-knifing or skidding on a slippery road?

If the retarder is fully engaged when driving around a bend

If the truck is braked harder than the trailer when driving around a bend

If the load largely impinges on the drive shaft

Here is Our AI Assistant's Explanation

Your selected combination is correct because both scenarios mention situations that increase the risk of a semi-trailer truck jack-knifing or skidding on slippery roads.

1. Engaging the retarder fully while driving around a bend can cause the trailer to lose grip, as the braking force may not be evenly distributed.
2. Braking harder on the truck than on the trailer creates a situation where the trailer may slide out, leading to a potential jackknife.

This aligns with German traffic safety regulations that emphasize the need for balanced braking to maintain control of vehicles, especially under slippery conditions.

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Danger/hazard awareness What to do as a road user Right-of-way / Priority Traffic signs Environmental protection Technical aspects Fitness and qualification of motor-vehicle operato Regulations on the operation of vehicles

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