Question

if you stop on the shoulder of the road in heavy fog, warn other drivers that you are not moving by

using emergency flashers
periodically sounding the horn
keeping headlights on
shutting headlights off

Explanation:

Analyze the hazard and visibility conditions

Heavy fog significantly reduces visibility, making stopped vehicles on the shoulder a major hazard.

Evaluate the safety options for signaling a stopped vehicle

• Using emergency flashers (hazard lights) is the standard, legally required method to warn other drivers that a vehicle is stationary.
• Sounding the horn periodically is ineffective and causes confusion.
• Keeping headlights on can mislead drivers behind you into thinking you are still moving in the active lane, potentially causing them to follow you onto the shoulder.
• Shutting headlights off but turning on emergency flashers ensures you do not project forward-facing glare or mislead other drivers, while still remaining visible via hazard lights. However, the primary active warning signal for a stationary vehicle is the emergency flashers.

Answer:

• using emergency flashers (Correct answer)
• periodically sounding the horn
• keeping headlights on
• shutting headlights off