What do temporary traffic lights at road works mean?

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

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?

Legal Matters/Rules of the Road