UK Driving Theory Practice Exam 2026 - Free Driving Theory Practice Questions and Study Guide

The maximum speed limit for cars on a dual carriageway is 70 mph. This speed limit applies to vehicles that are not towing a trailer or are not designated as heavy goods vehicles. Dual carriageways are designed for higher-speed travel compared to single carriageways, as they feature separated lanes for opposing traffic, allowing for safer and faster movement.

In practicality, exceeding this limit, such as suggested by an option like 80 mph, could pose significant risks not just to the driver and passengers, but also to others on the road due to potential collisions from over-speeding. A lower speed, like 50 mph or 60 mph, may apply in specific circumstances, such as adverse weather conditions or if signage indicates a temporary speed limit reduction. However, under normal circumstances for standard vehicles, 70 mph is the official maximum speed on dual carriageways.