Lane signals in tunnel areas, control areas and trunk roads/expressways

Lane signals are often used in tunnel areas, control areas and trunk roads/expressways. In normal conditions, they are switched off or show a green downward arrow or a green light. In the occurrence of incidents, amber lights flash and the signal shows what action must be taken.

In most tunnels or on trunk roads/expressways, the lane signals are overhead, one applying to each lane. In some places, the signal is on the roadside, central reservation or on the tunnel wall alongside the traffic lane or slip road to which it applies.

Illustrated on the right are the displays of the overhead lane signals.

The lane signals are for safety. Always act on them - danger may be present even if you cannot see the reason.

A green downward arrow, a green light or a blank face means you may proceed in the lane if it is safe to do so.

The flashing amber light warns of danger ahead, for example, a traffic accident, an obstruction or adverse weather conditions. Drive with caution and be prepared to stop.

A green diagonal downward arrow pointing to the left (as shown) or right means you must leave the lane in the direction shown. Do not change lanes suddenly and do not move over unless it is safe to do so. If you reach the danger or obstruction or a red light before you can safely leave the lane, stop and wait in that lane until it is safe to change lanes.

A red cross or a red light means you must not proceed beyond the signal in the lane.