Final answer:
When a driver sees a yellow flashlight on a tow truck or a slow-moving vehicle, they should proceed with caution and be prepared to slow down or stop if necessary.
Step-by-step explanation:
When a driver sees a yellow flashlight on a tow truck or a slow-moving vehicle, they should proceed with caution and be prepared to slow down or stop if necessary. The yellow flashlight is an indication that there is a potentially hazardous situation on the road ahead. By slowing down and being alert, drivers can avoid accidents and ensure the safety of themselves and others.