You are driving on a road with street lights but you cannot see any speed limit signs. What is the speed limit likely to be?

Why?

A system of street lighting usually means you are in a built-up area where people live and walk. Rule 124 of The Highway Code says that where there are street lights the limit is normally 30 mph, unless signs show a different limit. So if you see no speed signs, treat it as a 30 mph road.

Highway Code rule 124