A series of steady or flashing yellow lights forms a barrier device. What does it indicate?

It allows crossing the barrier if the lights flash.

The barrier prohibits passage only when the lights are steady.

A series of steady or flashing yellow lights forms a barrier device…

Correct answer

It prohibits crossing the imaginary line joining the lights.

Passing through the imaginary line joining the lights is prohibited, whether steady or flashing. The restriction is the barrier, which must not be crossed; do not confuse it with a flashing amber traffic light. A steady red delineation light indicates the carriageway is entirely closed to traffic.

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All options

It allows crossing the barrier if the lights flash.
The barrier prohibits passage only when the lights are steady.
It prohibits crossing the imaginary line joining the lights.

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Glossary terms in this question

Traffic light
A device regulating traffic with red, amber and green lights. It precedes vertical signs and road markings, but not officers’ directions, temporary signs or beaconing.