In the winter of 1959, around six thousand people died on British roads. Seat belts were optional extras. Crash barriers were rare. And nobody was legally required to check whether your car’s brakes actually worked. That changed — slowly, and with a great deal of political arguing — over the following decade.
1960: the first ten-year test
The Ministry of Transport test began on 13 September 1960, under the Road Traffic Act 1956. Ernest Marples, the Transport Minister who also happened to have a stake in a motorway construction company, introduced what became known as the MOT-10: a mandatory annual test for any vehicle ten years old or more.
The scope was narrow. Testers checked brakes, lights, and steering. Nothing else. Garages were approved by the Ministry to carry out the work, a model that still holds today.
Roughly 1.6 million vehicles fell under the first round of testing. Most were pre-war or early post-war British saloons. The failure rate was eye-watering — somewhere near 80 percent, by most contemporary accounts, though the Ministry did not publish a clean national figure. The popular press reported cars whose brake pedals hit the floor. The political case for expanding the test was made almost immediately.
1961 and 1967: closing the age gap
Two years after launch, the threshold dropped to seven years old. In 1967 it dropped again, to three years — the age limit that still applies today. These weren’t arbitrary round numbers. Three years aligned broadly with the end of the manufacturer warranty period on most family cars, after which owners were more likely to defer maintenance.
The 1967 change brought millions of additional vehicles into annual testing for the first time. It also created the modern second-hand car market dynamics that persist now: a three-year-old car with a fresh MOT commands more confidence than one a month before its first test.
1968: the Ministry disappears, the name stays
The Ministry of Transport was abolished in 1968, merged into the new Department for the Environment. Officially, the test became the “DoE test” for a period. Nobody called it that. The abbreviation “MoT” had already embedded itself in British shorthand, and it stayed there regardless of which department administered it. By the 1980s the lower-case “mot” was appearing in classified ads as a freestanding noun: full mot, one owner.
Government attempts to rebrand the test over the years have quietly failed. DVSA literature uses “MOT test” throughout, acknowledging that the Ministry of Transport ceased to exist before many current car owners were born.
1991: emissions join the checklist
The introduction of emissions testing in 1991 was driven partly by the EU’s type-approval directives and partly by growing public concern about urban air quality. Catalytic converters had become compulsory on new petrols from 1993 onwards (though some manufacturers fitted them earlier), and the test needed to catch the cars running without working cats.
For petrol engines the tester checks CO and HC levels at idle and fast idle. Diesels — brought into emissions testing in stages through the 1990s and refined through the 2000s — are tested for particulate opacity, the familiar diesel smoke test that remains contentious among older van owners.
The emissions section has been amended repeatedly since 1991. The current version of the DVSA’s inspection manual distinguishes between naturally aspirated and turbocharged diesels, and sets different thresholds for pre- and post-2008 cat-equipped petrols.
2012: paper certificates go digital
For the first half century of the MOT, the pass certificate was a piece of paper — VT20, in DVSA terminology — that owners needed to keep alongside their V5C and insurance documents. Garages filed the counterpart; DVSA held duplicates. The system was operationally clumsy and fraud-prone. A skilled forger with the right paper stock could manufacture a plausible VT20.
From 2012, the DVSA moved to a central electronic database. Every test result is logged in real time. The paper certificate technically still exists as a printed confirmation, but the legal record is the database entry. DVSA’s MOT history check — available free at gov.uk — pulls directly from that database, showing every test, every failure reason, and every mileage reading logged since digitisation.
This matters practically. A mileage discrepancy between consecutive MOT records is visible to any buyer in thirty seconds. It has not eliminated odometer fraud, but it has made the clumsier forms of it immediately obvious.
2018: four categories replace two
Before May 2018, the MOT had a binary output: pass or fail, with an advisory notice for items worth watching. From that point, the DVSA introduced four categories for defects:
Dangerous — an immediate risk to road safety or the environment. The vehicle cannot be driven away.
Major — a fault that significantly affects road safety. This is an automatic fail.
Minor — a defect with no significant effect on safety. Recorded but does not cause a failure.
Advisory — not yet defective but worth monitoring. Recorded and passed to the owner.
The change came from an EU directive (2014/45/EU), implemented before Britain left the bloc. The stated aim was consistency across member states — a Major defect in a UK garage should mean roughly the same thing as in a German one.
For drivers, the practical effect was an increase in the amount of information on the pass certificate. A car that passes its MOT can now leave with a list of Minors and Advisories that would previously have been delivered verbally, or not at all.
Where things stand now
The MOT remains an annual requirement for most cars from their third birthday. DVSA publishes the full defect data — 89 million individual defect records for the 2023 test year — under the Open Government Licence. The test itself has not fundamentally changed since 2018, though the DVSA updates the inspection manual periodically to reflect new vehicle technologies.
The political arguments have shifted too. There are periodic calls to extend the MOT interval for newer cars — three years to the first test, then every two years rather than annually. DVSA research in 2017 found that extending the interval would result in more defects accumulating between checks. The annual cycle has held.
What started as a check on pre-war lorries now processes around 38 million tests per year. Ernest Marples probably did not see that coming.