Snowstorm Driving Preparations:
• Before a storm, fill your fuel tank
• Drive slow with your headlights on
• Do not pass snowplows
• Stay several car lengths behind snowplows
• If approaching a snowplow, slow down and give the plow extra room
• Please avoid parking on streets, if possible, to facilitate snowplows
Source: https://azdot.gov/.../severe-weather/know-snow-and-ice
Original source can be found here.