What should you do?
If you drive or tow a tall vehicle or load, check the clearance and never raise tipping bodies, cranes or masts under the cables.
How to recognise it
Yellow diamond with a black lightning bolt and an insulator symbol above it.
Common confusion
It looks similar to the road works version on an orange background, which warns of temporary cables at a work site.
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.
