Understanding UK Assimilated Drivers’ Hours Rules
If you drive for a living, you already know the days can be long and the job demanding.
But one thing you can’t afford to guess is how long you’re legally allowed to drive.
The UK assimilated drivers’ hours rules (formerly EU rules) exist for a reason —
they protect drivers from fatigue, keep roads safer, and ensure operators stay on the right side of the Traffic Commissioner.
The truth is, these rules can look complicated. Daily limits, fortnightly totals, breaks,
working time, and “ferry mode” — it’s a lot to get your head around.
So this guide breaks everything down clearly. No jargon. No complicated legal language.
Just a straight explanation of what the UK assimilated drivers’ hours rules are
and how to stay compliant without stress.
Whether you’re new to commercial driving or simply want a refresher, you’ll find everything you need to understand:
- Your legal daily driving limits
- How to split your breaks correctly (without breaking the law)
- Weekly and fortnightly maximum driving time
- Working time limits (including the “Night Work” trap)
- Daily and weekly rest requirements
Daily Driving Limits
The UK assimilated drivers’ hours rules set strict limits on how much driving you can legally complete in a day.
- 9 hours daily driving limit
- You may extend to 10 hours on no more than two days per week
These limits are strict. Overrunning them puts you at risk of fixed penalties and prohibitions.
Weekly and Fortnightly Driving Limits
To prevent long-term fatigue, the rules also cap your total driving time over longer periods:
- 56 hours maximum driving per week
- 90 hours maximum driving over any two consecutive weeks
Pro Tip: Many infringements occur because a driver maxes out their hours in Week 1 (e.g., 56 hours)
and forgets they only have 34 hours left for Week 2 to stay under the 90-hour fortnightly limit.
Break Requirements — Don’t Get Caught Out
Breaks are not optional. Under the UK assimilated drivers’ hours rules:
- After 4 hours 30 minutes of driving, you must take a 45-minute break.
The “Split Break” Rule (Warning)
You can split this break, but the order is fixed. You must take:
- A break of at least 15 minutes
- Followed by a break of at least 30 minutes
Warning: You cannot switch this around. Taking 30 minutes first and 15 minutes later does not count as a valid break, and you will be fined.
Daily and Weekly Rest Requirements
Rest periods are essential for legal compliance.
Daily Rest
- 11 hours of daily rest every 24 hours.
- This may be reduced to 9 hours, up to three times between weekly rests.
Weekly Rest
- Regular weekly rest: 45 continuous hours.
- Reduced weekly rest: Minimum 24 hours (allowed every other week).
Compensation for Reduced Rest
If you take a reduced weekly rest (e.g., 24 hours), you must “pay back” the missing hours.
This compensation must be taken en bloc (in one go) and attached to another rest period of at least 9 hours
before the end of the third week following the week in question.
Working Time Rules & Night Work
Driving time is only part of the picture. The Road Transport Working Time Regulations also apply.
- 48-hour average weekly working limit (averaged over 17-26 weeks).
- 60-hour maximum working time in any single week.
The “Night Work” Trap
If you perform any work (driving, loading, checks) between the hours of 00:00 and 04:00,
your total working time for that shift is limited to 10 hours
(unless a valid collective workforce agreement states otherwise).
Ferry & Train Rules
For international drivers, you may interrupt your daily rest to embark or disembark a ferry or train.
- You may interrupt your rest a maximum of two times.
- The total time for these interruptions must not exceed 1 hour.
- You must have access to a bunk or couchette for the rest of the period.
Summary Table — Key Limits at a Glance
| Category | Limit / Requirement |
|---|---|
| Daily Driving | 9 hours (can extend to 10 hours twice a week) |
| Weekly Driving | Max 56 hours |
| Fortnightly Driving | Max 90 hours (over 2 weeks) |
| Breaks | 45 mins after 4.5 hours (Split: 15 mins then 30 mins) |
| Daily Rest | 11 hours (Reduced: 9 hours, max 3 times/week) |
| Weekly Rest | 45 hours (Reduced: 24 hours, with compensation by Week 3) |
| Working Time | Max 60 hours/week (48hr average). Night work limit: 10 hours. |
Need More Help Understanding Compliance?
If you want a deeper understanding or need support for your drivers, we cover the UK assimilated drivers’ hours rules in detail during our courses:
- Online Driver CPC Training (Ideal for drivers)
- Transport Manager CPC Course (For managers)
- Operator Licence Awareness Training (OLAT) (For directors & owners)
Clear training keeps your drivers safe — and your O-licence protected.
