A flashing blue light mounted on a motor vehicle indicates what?
- A police emergency vehicle
- Snow removal equipment ✓
- A motor vehicle carrying explosives
- An ambulance
Answer: B. Snow removal equipment
Flashing blue lights mounted on a motor vehicle mark snow removal equipment, such as a snow plow working on a public roadway.
Why this is the answer
The handbook says snow-removal vehicles on public roads carry flashing blue lights that can be seen from 150 metres. Those lights warn you that the vehicle is wide and slow-moving: a snow plow's wing can reach three metres to the right of the vehicle. So when you see blue flashing lights ahead, you are being warned about a plow, not about police, explosives or an ambulance.
Why the other answers are wrong
- A. A police emergency vehicle — Police emergency vehicles are described in the handbook as stopping with red, or red and blue, lights flashing, so a blue light on its own points to snow removal rather than police.
- C. A motor vehicle carrying explosives — Nothing in the passages connects a flashing blue light to a vehicle carrying explosives.
- D. An ambulance — The passages never describe an ambulance as using a flashing blue light.
Remember it
Blue means a plow is working ahead of you, so picture a wide blade or wing reaching out to the right and give it room.