FMCSA Adverse Driving Conditions: 2-Hour HOS Extension

3 Mar 2026 · 5 min
4:57

The video provides a step‑by‑step instructional overview of the FMCSA adverse driving conditions (ADC) Hours‑of‑Service (HOS) exception introduced in the 2020 revisions to §395.1. It explains that drivers may extend both the 11‑hour driving limit and the 14‑hour on‑duty limit by up to two hours when faced with unexpected, severe weather or road conditions that prevent safe completion of a trip. The presenter defines what constitutes an adverse driving condition, offers concrete examples (heavy rain, snow, fog, high winds, unexpected traffic, road closures, etc.), and outlines a two‑point test to determine eligibility. The tutorial then details the required actions: assess conditions, document the event in the electronic logging device (ELD) with date, time, notes, photos or video, notify the carrier if applicable, switch duty status to “adverse,” and return to normal duty as soon as conditions improve. It emphasizes that the extension is limited to two hours per duty day, there is no limit on the number of days it can be used, and that law‑enforcement may audit logs for proper use. Practical tips for logging the exception in various ELD systems are also provided. The overall purpose is to ensure drivers understand how to safely and compliantly use the ADC exception without risking violations.

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