Would your drivers tell you if they were too tired to drive?

Your driver can be fully legal on hours and still exhausted: here's what to actually watch for

Research commissioned by the Department for Transport found that 60% of HGV drivers regularly feel fatigued while driving, and 30% had fallen asleep at the wheel at least once in the previous year, despite being fully compliant with drivers' hours and working time rules. That's worth sitting with for a moment: this isn't a story about drivers breaking the rules. It's drivers following them completely and still being genuinely, dangerously tired.

Which means the real question for an operator isn't "are we legal." It's "would we actually know if one of our drivers was too tired to be safe, and would they tell us if they were." Here's what's worth knowing on both counts.

The warning signs, in a driver and in yourself

Fatigue has a recognisable pattern before it becomes dangerous, and it's worth knowing what to actually look for rather than waiting for the obvious. The early signs are difficulty concentrating, yawning, and heavy eyelids. As it progresses, eyes start to "roll" rather than blink normally, and attention drifts, missed exits, drifting within the lane, losing track of the last few miles. By the time a driver's head is actually nodding, they may already be experiencing microsleep, a few seconds of genuine unconsciousness with the eyes open, which is exactly the mechanism behind a huge proportion of fatigue-related crashes.

None of that shows up on a tachograph. It shows up in how a driver looks and sounds on a call, in a depot conversation, or in their own willingness to say something before it gets that far.

What actually helps, beyond hours compliance

Build a genuine no-blame reporting culture, and mean it. This is the single biggest lever, and it costs nothing except discipline. A driver needs to know that saying "I'm too tired to carry on" gets a safe solution, not a problem for their record or their pay.

I've heard the response that actually gets given often enough to know it's not rare: "well, if you're tired, go home now, we can't legally let you carry on." No offer of a 15-minute break. No swap to a shorter or less monotonous run. Just an instant, unpaid end to the shift, dressed up as a safety response. That's not a no-blame culture, it's a punishment with a legal justification bolted on, and drivers work it out fast. The lesson they take from it isn't "I can be honest about fatigue." It's "saying I'm tired costs me money, so I won't say it next time." If that's what reporting fatigue actually leads to in your operation, you don't have a reporting culture, you have a reason for drivers to stay quiet, and that's a far worse position to be in than not having a policy at all.

Make the response simple and known in advance. Drivers should know exactly what to do if they start feeling unsafe: pull over somewhere safe and contact the depot or office immediately. Safety comes before the schedule, and that has to be said out loud and meant, not just written in a policy nobody's read.

Plan schedules around when fatigue actually peaks, not just the legal minimum. Sleep-related incidents cluster in two windows regardless of how legal a driver's hours are: 2am to 6am, and 2pm to 4pm. A schedule that's legal but routinely puts a driver on the road through the early hours, with a long monotonous leg, is building in risk the paperwork won't show.

Take breaks seriously, not just the legal minimum. The Highway Code recommends a 15-minute break every two hours, which is a genuinely useful break more often than the legal 45-minute break after 4.5 hours of driving. The two aren't the same thing, and treating the legal minimum as the target rather than the floor misses the point of why breaks exist.

Think about the drive home, not just the shift. A driver who's worked a long or irregular shift and is now driving themselves home exhausted is still a fatigue risk, even once they're off the clock and off your books. It's worth actually raising this with drivers directly rather than assuming it's their problem once the shift ends.

Risk-assess the driver and the journey, not just the vehicle. Some drivers carry more fatigue risk than others, a long commute eating into rest, irregular shift patterns, known sleep issues, and some routes carry more risk than others, long monotonous stretches, early-hours running. Treating fatigue risk as something to actually assess, the way you'd assess any other workplace hazard, rather than something the drivers' hours rules have already handled, is the difference that matters.

The brief legal bit

For the record: drivers' hours rules govern driving time and rest, the Road Transport (Working Time) Regulations 2005 separately govern total working time, and a driver can be entirely compliant with both and still be the 60% the DfT's own research describes. That's not a loophole to close with more paperwork. It's the reason welfare has to be managed as its own thing, not assumed as a side effect of compliance.

If you'd like your fatigue risk management looked at properly as part of a full audit, get in touch at enquiries@ukfleetaudit.co.uk.

Compliant fleets don't get lucky. They get built that way.

References

TRL (2023) Research into Drivers' Hours and Working Time (PPR2014). Department for Transport. Available at: https://assets.publishing.service.gov.uk/media/6509677ca41cc3000d5613b9/research-into-drivers-hours-and-working-time-report.pdf (Accessed: 4 October 2026).

Health and Safety Executive (2014) Driving and riding safely for work (INDG382). Available at: https://www.hse.gov.uk/pubns/indg382.pdf (Accessed: 4 October 2026).

Brake (2026) Driver fatigue. Available at: https://www.brake.org.uk/get-involved/take-action/mybrake/knowledge-centre/driver-fatigue (Accessed: 4 October 2026).

Driving for Better Business (2025) Driver fatigue, we need to talk. Available at: https://www.drivingforbetterbusiness.com/articles/driver-fatigue-we-need-to-talk/ (Accessed: 4 October 2026).