What does this sign mean?

Explanation: It's essential to know the height of your vehicle before setting off. This should be clearly marked, usually in the cab, and visible from the driving position. Look out for restrictions that you may not have seen on a map - they may be temporary.

Category: Vehicle Weights and Dimensions

References: The Official DVSA Guide to Driving Buses and Coaches: Section 3, The Official DVSA Guide to Driving Goods Vehicles: Section 2, Highway Code: Page 109, Know Your Traffic Signs: Page 26