Special conditions1 of 2
You are driving when a severe dust storm approaches. What is the safest action?
The answer
Answer: D. Pull aside as soon as possible, before visibility drops to zero. Drive completely off the highway and stop as far right as possible. Do not stop in the travel lane or emergency lane. Turn off your lights and take your foot off the brake, stay in the vehicle with your seat belt buckled, and wait for the dust storm to pass.
Source: Arizona Driver License Manual — Dust storms (p. 43-44)