In the interests of road safety, temporary mandatory speed limits are imposed at all major roadworks. Signs like this, giving advance warning of the speed limit, are normally placed about three-quarters of a mile ahead of where the speed limit comes into force.
The speed-limit change at the end of the motorway
An advisory change of speed limit ahead
A variable speed limit ahead
A mandatory speed-limit change ahead
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93%
Based on figures from 2017.DVSA National average 47%