Final answer:
In a dust storm that reduces visibility on the freeway, you should slow down and turn on your vehicle's headlights for safety.
Step-by-step explanation:
When a dust storm blows across the freeway and reduces your visibility, it is recommended that you slow down and turn on your vehicle's headlights.
Using your headlights in reduced visibility conditions helps make your vehicle more visible to other drivers on the road and can assist you in seeing the road more clearly.
In some regions, there may be specific laws requiring the use of headlights during dust storms or in any situation where visibility is significantly reduced.