What sign warns drivers about an approaching tunnel?
- 633
- 127p.
- 634
- 138· Correct answer
Explanation
Sign 138 is a warning sign announcing a tunnel ahead on the road. Signs 633 and 634 are information signs about entering and exiting a tunnel.
How to approach it
Tunnel warning sign = 138 (triangular shape)
138tunnelwarning
Common mistake
Confusing the warning sign (138) with the information signs (633, 634)
Related signs
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