What is the advisory speed limit on a motorway when using blue lights?

The correct advisory speed limit on a motorway when using blue lights is indeed 90mph. This speed limit is significant for emergency vehicles, including ambulances, which are permitted to exceed the standard motorway speed limits in certain circumstances to respond effectively to emergencies.

When an emergency vehicle is responding to a call and utilizing blue lights, drivers are trained to operate under the principle of being responsive and attentive while also maintaining safety. The advisory speed is established to balance the need for rapid response with the necessity of safety for both the crew and the public on the road.

Please note that while utilizing blue lights, drivers must still use discretion and adjust their speed according to traffic conditions, weather, and road safety considerations. The 90mph limit is not an outright speed limit but serves as a guideline to facilitate efficient response while reminding drivers of their responsibilities.