If you park on an insufficiently lit through road, what lights must you leave on?

A)The sidelights and the dipped headlights.
B)None.
C)The sidelights, which may be replaced by parking lights if the vehicle is parked in line.Correct
You must switch on the sidelights when stopping or parking is carried out on the carriageway or hard shoulder of an insufficiently lit through road.
The sidelights may be replaced by parking lights or by the two sidelights on the side corresponding to the carriageway when parking in line.