A light signal with no level crossing sign is positioned before a level crossing, and in front of a junction with a road to the right. The red light is illuminated. Where must you wait?

Your answer is correct. When a red light is illuminated at a light signal before a level crossing (without a level crossing sign) and a junction, you must stop either at the stop line if there is one or in front of the signal if there is no stop line. This rule ensures you stay clear of the level crossing and any intersecting traffic until the signal changes to green. Driving up to the level crossing despite the red signal is not allowed, as it can endanger you and others. The stop line or the signal itself marks the safe stopping point.