What does a continuous white line in the centre of the road mean?

Vehicles may perform a U-turn.
Vehicles may park during daylight hours only.
Vehicles may not cross or drive over the line.
Vehicles may cross the line for a short time.

Explantion: You must not cross or straddle a continuous white line in the centre of the road unless you wish to enter land or premises and it is safe to do so.

Theory Tester

What does a continuous white line in the centre of the road mean?

Control of Vehicle