
The length of a low bridge
The distance to a tunnel
The length of a tunnel
The distance to a low bridge
Explanation: As well as a height restriction, the tunnel may have a restriction on the available width of headroom for high vehicles. The advance warning gives you the opportunity to find another route if your vehicle is too high or wide to drive through the tunnel.
Category: Vehicle Weights and Dimensions
References: Highway Code: Page 108, Know Your Traffic Signs: Page 12
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