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UK Speed Limits: Every Road Type Explained

Speed limits apply differently depending on road type, vehicle type, and conditions. Here's the definitive guide.

5 min read

Exceeding a speed limit is a serious fault on the driving test. Driving significantly below the limit when conditions don't require it can also be marked — it shows poor judgement. Understanding the limits for every road type is essential.

The Full Guide

Built-up area (street lighting present and no sign showing otherwise): 30 mph. Single carriageway national speed limit: 60 mph. Dual carriageway national speed limit: 70 mph. Motorway: 70 mph. Always look for posted signs — limits change frequently in modern road networks.

Common Faults

  • Driving at 30 mph in a 20 zone
  • Treating the national speed limit sign as "unlimited"
  • Driving significantly below the limit in clear conditions (poor judgement)
  • Not responding to variable speed signs on smart motorways

What the Examiner Looks For

  • Correct speed for the road type
  • Observation of all speed limit signs
  • Appropriate speed for conditions even within the limit

Quick Tips

  • 1If in doubt, slow down — 30 is safer than 40 in an unmarked area
  • 2Look for street lights — they usually indicate a 30 mph limit
  • 3Don't drive at the limit in poor visibility or heavy traffic
  • 4In Wales, default built-up area limit is 20 mph from September 2023

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