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

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If the retarder is fully engaged when driving around a bend

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

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If the load largely impinges on the drive shaft

Here is Our AI Assistant's Explanation

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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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