HOS (Hours of Service)
FMCSA regulations limiting driving and on-duty time for commercial motor vehicle operators to prevent fatigue-related accidents.
Key Facts
- 11-hour driving limit after 10 consecutive hours off duty
- 14-hour on-duty window from coming on duty
- 30-minute break required after 8 hours of driving
- 60/70-hour weekly limits with 34-hour restart option
Hours of Service rules (49 CFR Part 395) limit CMV drivers to: 11 hours of driving after 10 consecutive hours off duty, within a 14-hour window after coming on duty, and with a required 30-minute break after 8 cumulative hours of driving. The 60/70-hour limit caps on-duty time over 7/8 consecutive days. The 34-hour restart provision allows drivers to reset their weekly clock. Electronic Logging Devices (ELDs) are required for most CMV drivers to automatically record HOS compliance.
CMV Driver Credentials Compared
Licenses, certificates, and registrations required for commercial motor vehicle operators.
| Type | Issued By | Purpose | Validity Period | Required For |
|---|---|---|---|---|
| CDL | State DMV | License to operate CMVs | Per state renewal cycle | Vehicles > 26,001 lbs / 16+ passengers |
| MEC (DOT Card) | NRCME examiner | Proof of medical fitness | 1–2 years | All CDL holders |
| NRCME Listing | FMCSA | Certifies medical examiners | 10 years | Examiners performing DOT physicals |
| HOS Compliance | FMCSA / ELD | Tracks driving/on-duty time | Continuous | Most CMV drivers |
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