What are the legal speeds for lorries?

When the legal speed for lorries is `governed` at 56mph, why are the supermarket lorries allowed to slow down the traffic on single lane `A` roads?

I find it really frustrating by only doing 40mph, supposedly `helping the environment`...

Asked on 8 June 2014 by carol-anne

Answered by Honest John
Unfortunately because the 'A' road (single carriageway) limit for all HGVs is 40mph. There are arguments for it to be raised when the vehicles are unladen. But 40 tonnes descending a hill at 60mph would not be stoppable.
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