On smart motorways and motorways under Active Traffic Management (ATM), electronic signals on overhead gantries and roadside signs display mandatory instructions and vital safety warnings. Match each smart motorway signal or display with its exact legal requirement and required driver action.
- A red 'X' illuminated on an overhead gantry display directly above a specific laneStrict legal prohibition against driving in that lane; the lane is closed due to a hazard, blockage, or emergency response ahead.
- A numerical speed limit displayed inside a solid red circle on an overhead electronic gantryLegally enforceable mandatory maximum speed limit that applies until changed or cancelled by a national speed limit sign.
- Pairs of red lights flashing alternately in horizontal unison above all lanes accompanied by a 'STOP' signMandatory instruction requiring all vehicles to stop before reaching the gantry and not proceed past it across any lane.
- An illuminated white arrow pointing diagonally downwards towards the lane to the leftMandatory instruction requiring drivers to move across to the lane on the left as soon as it is safe to do so.
Answer
The Red 'X' matches with the strict legal prohibition against driving in that lane; the speed limit in a red circle matches with the legally enforceable mandatory maximum speed limit; the flashing red lights above all lanes match with the mandatory instruction to stop before reaching the gantry; and the diagonal white arrow matches with the mandatory instruction requiring drivers to move across to the lane on the left.
Each smart motorway gantry signal has a distinct legal definition under the UK Highway Code. A red 'X' mandates that the specific lane is closed to all traffic; a numerical speed limit inside a red circle sets an enforceable mandatory maximum speed; horizontal flashing red pairs over all lanes mandate that all vehicles stop before the gantry; and a diagonal arrow requires drivers to merge safely into the indicated lane ahead of a closure.
Step-by-Step Solution
Key Concept
Smart Motorway Gantry Signals and Legal Compliance
Estimated Time:1m 30s