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Difficulty: Very hardTowing Trailers and Caravans

You are driving a passenger car and towing a braked caravan on a dual carriageway where the national speed limit applies. The road surface is wet following heavy rain. What is your maximum legal speed limit, and how must you adjust your safety margins for the conditions ahead?

  1. A
    70 mph; you must double your normal following distance to at least four seconds to compensate for the wet surface.
  2. B
    50 mph; you must increase your separation distance primarily because the added weight of the caravan increases your thinking distance.
  3. 60 mph; you must increase your normal following distance to at least four seconds to account for the wet conditions.Answer
  4. D
    60 mph; you should maintain a standard two-second separation distance because the caravan's braking system will safely offset the added momentum.

Answer

60 mph; you must increase your normal following distance to at least four seconds to account for the wet conditions.
The correct answer accurately synthesizes two critical Highway Code rules: vehicles towing a caravan or trailer are restricted to 60 mph on dual carriageways (unlike the 70 mph limit for solitary cars), and the standard two-second separation distance must be doubled to at least four seconds when driving on wet roads to account for significantly increased braking distances.

Step-by-Step Solution

1
Determine the correct speed limit for the vehicle combination on the specified road type.
The limit is 60 mph.
While the national speed limit on a dual carriageway for standalone cars is 70 mph, vehicles towing a caravan or trailer are legally restricted to a maximum of 60 mph.
2
Identify the standard dry-weather following distance.
The standard rule is a two-second time gap.
The Highway Code mandates a minimum two-second gap between your vehicle and the one directly ahead in dry, optimal conditions.
3
Calculate the required safety margin adjustment for the weather conditions.
The gap must be doubled to at least four seconds.
In wet weather, stopping distances are at least double those required on dry roads, so the time gap must be doubled to compensate.

Key Concept

Towing speed limits and wet weather safety margins
Estimated Time:1m 0s
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Topics

Towing Trailers and Caravans

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