What are the rules for Adverse Driving Conditions Exemption?

Related Questions

  • What are the rules for Adverse Driving Conditions?
  • Can my driver apply the Adverse Driving Conditions Exemption for a crash on the highway?

Applies To

  • Geotab Drive App
  • ELD
  • HOS
  • Exceptions


If unexpected adverse driving conditions slow you down, you may drive up to 2 extra hours to complete what could have been driven in normal conditions.

  • This means you could drive for up to 13 hours, which is 2 hours more than allowed under normal conditions.
  • Adverse driving conditions mean things that you did not know about when you started your run, like snow, fog, or a shut-down of traffic due to a crash.
  • Adverse driving conditions do not include situations that you should have known about, such as congested traffic during typical “rush hour” periods.
  • Even though you may drive 2 extra hours under this exception, you must not drive after the 14th consecutive hour after coming on duty, and you must comply with the minimum 30-minute rest break provisions.

Additional Notes: 

This public document is the HOS Ruleset Matrix where you can find the details of all Rulesets: