Great Britain Theory Test Coach
Speed and safety marginsQuestion 231 of 424

What is the national speed limit for a car on a dual carriageway?

  1. 70 mph
  2. 60 mph
  3. 50 mph
  4. 80 mph
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Correct answer: 70 mph

A car may go up to 70 mph on a dual carriageway, if conditions are safe.

Source: The Highway Code (Department for Transport, GOV.UK), General rules, techniques and advice for all drivers and riders (103 to 158), Rule 124

Practice speed and safety margins

Questions last reviewed: 18 October 2026