Which sign would warn of a hidden dip ahead?

• A. A triangular warning sign with a car descending into a dip
• B. A triangular warning sign showing two humps and the text '1/2 mile'
• C. A red triangular warning sign with a downward dip symbol
• D. A rectangular sign with a pothole illustration

Answer: (C)

A hidden dip ahead is a hazard where the road surface drops away out of sight, so you need to slow down and be prepared for a sudden change in the road level. The red triangular warning sign with a downward dip symbol is the standard way to warn of this specific hazard: the red border signals a warning, and the dip symbol communicates that the road will dip away ahead, even if you can’t see it yet. That clarity is why it’s the best match for a hidden dip ahead. The other signs point to different issues—two humps with a distance suggests an uneven or hump-related road feature, a pothole sign covers a different kind of surface defect, and a sign showing a car descending into a dip isn’t the standard indicator for a hidden dip.