Drivers’ hours law is not especially complicated, but it is surrounded by a folklore that is. The same myths circulate in cab mess-rooms and even traffic offices, and they surface later in tachograph analysis, roadside interviews and public inquiries. Here are the seven that do the most damage, with what the DVSA guidance actually says.
It does not. When a driver mixes domestic and assimilated driving, the domestic driving is recorded as other work under the assimilated rules, not as driving time against the 4.5-hour or 9-hour limits. The GB domestic 10-hour driving limit still applies to the domestic driving itself. Drivers who treat the regimes as interchangeable clocks end up breaching one while watching the other.
There is exactly one lawful split: a break of at least 15 minutes followed later in the driving period by a break of at least 30 minutes. Thirty then fifteen is an infringement. So is three fifteens. And anything under 15 minutes does not count toward a break at all, though mercifully it does not count as duty either.
Scope does not depend on load. A vehicle over 3.5 tonnes used for carrying goods is in scope of the assimilated rules whether it is full, half-loaded or running empty to the next job. Equally, a short spell of in-scope driving puts the whole day under the assimilated rules: there is no “only an hour of EU rules today”.
Only sometimes. A break must be a period used exclusively for recuperation, with no driving and no other work, and during rest the driver must freely dispose of their time. Waiting that the driver can genuinely spend as they choose may qualify; waiting where the driver must remain available, supervise loading or stay with the vehicle does not. The bay queue is where many an imaginary break has been logged.
Weekly rest is measured precisely. It must start no later than the end of six consecutive 24-hour periods after the last weekly rest, a regular weekly rest is at least 45 continuous hours, and in any two consecutive fixed weeks, Monday to Sunday, the driver needs either two regular rests or one regular plus one reduced rest of at least 24 hours, with the reduction compensated in one block before the end of the third following week. A rolling “day off” pattern can breach all of that while feeling perfectly regular.
It depends whose idea it was. Driver CPC training requested or instigated by the employer counts as duty, not rest. Only genuinely voluntary training can sit inside a rest period. The operator who schedules CPC days into a driver’s weekend and calls it rest is creating an hours offence with a certificate attached.
They are separate regimes with separate limits. The assimilated rules cap driving; the Road Transport (Working Time) Regulations cap total work, averaging 48 hours over the reference period with a 60-hour ceiling in any single week, their own break triggers at 6, 9 and more than 9 hours of work, and a 10-hour cap on night work. Loading, paperwork and waiting on duty feed the working time clock without touching the driving one, which is how a driver can be legal on hours and illegal on working time in the same shift.
Folklore survives because it is easier to repeat than to check, and because it usually has a grain of history in it: rules change, and yesterday’s correct answer becomes today’s infringement. The operators who keep their cabs myth-free do two things. They train from the current DVSA guidance rather than from inherited wisdom, refreshing it when the guidance changes. And they treat the infringement report as a diagnostic: a driver repeating a myth is a briefing opportunity, while several drivers repeating the same one is a sign the myth lives in the traffic office itself.
The rules are published, free and stable enough to learn properly. The myths are expensive, and they compound: every uncorrected repetition teaches the next driver. That should make the choice easy.