What’s the speed limit for the car towing the caravan on this road?

Explanation: The speed limit when you're towing a caravan or trailer is lower than the limit for a car that's not towing.
This is mainly because the increased length and weight of the combination make it more difficult to control.
When you're towing a caravan or trailer, you should take your time with any manoeuvres. You should also allow more time for slowing and stopping.

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References: The Official DVSA Guide to Driving: Section 19, Highway Code: Rule 124