Which symbol warns of a hidden dip in the road?

• A. A warning sign with an exclamation mark
• B. A warning sign showing a double hump
• C. A triangular warning sign depicting a dip in the road
• D. A sign with a wave symbol

Answer: (C)

Warning signs use simple pictures to alert you to specific road hazards ahead, and a dip in the road is one of those hazards you’ll be warned about with a triangular sign showing the road dipping down and back up. When you see this symbol, it means the road surface will fall away and then rise again, which can affect steering and braking, especially if the dip isn’t clearly visible until you’re close. If the dip is hidden, you’ll want to slow down, keep a good following distance, and be ready for a sudden change in the road level or for oncoming traffic appearing from the dip.

The other signs aren’t the same hazard. An exclamation mark in a triangle is a general warning for unspecified hazards, not the specific dip. A sign with two humps indicates speed bumps or a series of humps. A wave-like sign doesn’t correspond to the dip hazard in standard UK signage. So the triangular sign that depicts a dip correctly communicates the hidden dip ahead.