What should you do?
Slow down, keep left and do not overtake, as you may not see what is just over the crest.
How to recognise it
Yellow diamond with a black road profile and a single rounded hump in the middle.
Common confusion
The opposite of the sharp dip sign, and different from a single speed ramp sign used in traffic calming areas.
Explanation written by the My Driving Test editorial team using the Department of Transport Traffic Signs Manual conventions and the RSA Rules of the Road.
