The red circular sign with a diagonal line over a vehicle exploding signifies that vehicles transporting dangerous goods are prohibited from entering the specified area. This is a safety precaution to minimize potential risks.

This blue information sign advises drivers to switch on their headlights to improve visibility within the tunnel and turn on their radio (specifically mentioning local or BBC) to receive important traffic information or emergency broadcasts.

A green downward arrow displayed above a lane signifies that the lane is open for travel. Drivers in that lane can continue driving straight or perform other permitted maneuvers within that lane.

A flashing amber "X" is a caution signal indicating a potential obstruction or hazard in the lane ahead. While the lane is still open, drivers should reduce their speed and be ready to move to another lane if necessary to avoid the obstruction.

Drivers in that lane must safely move into an adjacent lane that has a green downward arrow or no prohibiting signal. Continuing in a lane marked with a red "X" is dangerous and could lead to traffic violations.