When approaching working service or maintenance vehicles:

Question

Yield the right-of-way to service vehicles and maintenance equipment engaged in work on roadways. Use extra caution in approaching, overtaking, or passing maintenance vehicles and snowplows. Because of their traveling speed and size, snowplows tend to create large clouds of blowing snow that conceal the plow, making it invisible.

Accepted Answer

Yield the right-of-way and exercise caution.

Answer

Treat them the same as you would any other motor vehicle.

Answer

Assume they will allow you to have the right-of-way.

Answer

Come to a complete stop until they are out of your line of sight.