Question

Hazard warning signals (4-way flash) are intended to warn other drivers that a vehicle is in a hazardous position on the roadway. The signal should be used when:

1. Driving through a tunnel.
2. Driving a heavy truck or bus up a hill.
3. Performing emergency vehicle maintenance on the road shoulder.
4. Both 2 and 3 above.

Answer 1

Hazard warning signals, or 4-way flashers, should be used when driving a heavy truck or bus up a hill and when performing emergency vehicle maintenance on the road shoulder.

Step-by-step explanation:

Hazard warning signals, also known as 4-way flashers, are intended to warn other drivers that a vehicle is in a hazardous position on the roadway. These signals should be used when driving a heavy truck or bus up a hill and when performing emergency vehicle maintenance on the road shoulder. Therefore, the correct answer is option 4: Both 2 and 3.