What do temporary traffic lights at road works mean?

A driver must comply with the lights at all times.
A driver must comply with the lights when workers are on site only.
A driver need not comply if a convoy of traffic is going in the same direction.
A driver need only comply when there is oncoming traffic.

Explantion: You must comply with any temporary traffic lights used to control vehicle movements at or near road works. It is an offence not to obey these lights.

Theory Tester

What do temporary traffic lights at road works mean?

Control of Vehicle