
Tunnel ahead
Speed camera
Low bridge
Accident blackspot
Explanation: A tunnel can present a number of dangers to large vehicles. Look out for height or width limits and always be aware of your vehicle's size. Reduce speed and turn on your headlights before entering the tunnel. Remove sunglasses if you're wearing them, and remember, your eyes may take a little time to adjust to the sudden darkness.
Category: Traffic Signs
References: Know Your Traffic Signs: Page 12
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