If heavy fog persists, which safety step is recommended?

Answer: A — Park at a rest area or truck stop until it has lifted

When visibility is severely reduced by heavy fog, the safest move is to get off the roadway and wait for conditions to improve. Park at a safe, designated area such as a rest area or truck stop, where you’re out of the main travel lanes and less exposed to other drivers who may not see you in time. Using high-beams in fog can blind you by reflecting off the fog, so switch to low beams (and use fog lights if available) to improve contrast without glare. Driving slowly but still on the road keeps you vulnerable to sudden hazards, and stopping on the left shoulder can put you in the path of oncoming traffic. Therefore, the recommended step is to park at a rest area or truck stop until it has lifted.