How often does a truck have to be tested in the EU?

One year after the date of first registration and annually thereafter. Article 5(1)(b) of Directive 2014/45/EU puts categories M2, M3, N2, N3, O3 and O4 — buses, coaches, goods vehicles over 3.5 tonnes and trailers over 3.5 tonnes — on that cycle, alongside M1 vehicles used as taxis or ambulances.

Does a bad inspection record mean being stopped more often?

Yes. Article 6 of Directive 2014/47/EU requires the number and severity of deficiencies found on an undertaking's M2, M3, N2, N3, O3 and O4 vehicles to be fed into the risk rating system, and states that the information is used to check undertakings with a high risk rating more closely and more often.

Roadworthiness tests and roadside checks: intervals, grades and the risk score

Q: What braking efficiency does a truck need to pass its roadworthiness test?

50 % for categories N2 and N3 first registered after 1 January 2012. For earlier registrations Annex I item 1.2.2 of Directive 2014/45/EU prints 43 %, but its footnote (4) reads '45 % for vehicles registered after 1988 or from the date specified in requirements, whichever is the later' — so 45 % is the operative figure for a pre-2012 truck and 43 % applies only to one registered in or before 1988. Reaching less than half of the applicable figure is a dangerous deficiency rather than a major one.

Q: What is the difference between a minor, major and dangerous defect?

Article 7(2) keeps safety and the environment together in all three. Minor: no significant effect on the safety of the vehicle or impact on the environment, and other minor non-compliances. Major: may prejudice the safety of the vehicle, have an impact on the environment or put other road users at risk, or other more significant non-compliances. Dangerous: a direct and immediate risk to road safety, or an impact on the environment, which justifies prohibiting the vehicle's use on public roads. Minor means the test is passed; major and dangerous both mean it is failed.

Q: How many trucks are stopped for roadside inspections?

Article 5(1) of Directive 2014/47/EU requires the total number of initial technical roadside inspections across the Union to correspond, in every calendar year, to at least 5 % of the M2, M3, N2, N3, O3 and O4 vehicles registered in the member states. The quota is written for points (a), (b) and (c) of Article 2(1) only; the commercial wheeled tractors in point (d) are inside the Directive but outside that calculation.

A roadworthiness certificate is the most commonly misread document in a used commercial vehicle file. It records what a defined list of checks found on one day, graded against a three-level scale, without dismantling anything. A run of certificates therefore tells a buyer more than any single pass — and it tells an operator something less comfortable, because the same results decide how often the fleet is stopped at the roadside.

Two directives divide the work and both are in force. Directive 2014/45/EU governs the periodic test and repealed Directive 2009/40/EC with effect from 20 May 2018; Directive 2014/47/EU governs the roadside inspection and repealed Directive 2000/30/EC on the same date.

The interval is set by category, not by age

Article 5(1) of Directive 2014/45/EU sets the minimum intervals, and the split falls where the 3.5-tonne line falls in the categories listed in Article 2(1).

Minimum test intervals — Directive 2014/45/EU, Article 5(1).
Category	First test	Thereafter
M2, M3, N2, N3, O3, O4; M1 used as taxis or ambulances	1 year after first registration	Annually
M1 and N1	4 years after first registration	Every 2 years
Wheeled tractors T1b to T4.3b used mainly on public roads for commercial haulage	4 years after first registration	Every 2 years

The tractor row is older than it looks. Article 5(1)(c) has carried the four-year, two-yearly cycle since the Directive was adopted on 3 April 2014, applicable from 20 May 2018; what Commission Delegated Directive (EU) 2021/1717 changed was the label, replacing the original “category T5” with the Regulation (EU) No 167/2013 list T1b, T2b, T3b, T4.1b, T4.2b and T4.3b — an adaptation its own recitals say does not affect the scope and frequency of the testing. The rest is stable: a 3.5-tonne van is on the four-year cycle, while a 3.6-tonne truck is tested a year after registration and every year after that, and so is a heavy trailer — the same threshold that governs how a combination is weighed and plated.

Five events that can pull the test forward

Article 5(4) lets the member state or competent authority require a test before the due date, whatever the date of the last one, in five cases: after an accident affecting main safety-related components such as wheels, suspension, deformation zones, airbags, steering or brakes; when safety and environmental systems or components have been altered or modified; where the holder of the registration certificate has changed; when the vehicle has reached a mileage of 160 000 km; and where road safety is seriously affected.

Two matter commercially. The mileage trigger is an odometer threshold rather than an interval, so it can arrive between annual tests rather than with them, and how far between depends on utilisation. The driving-time ceiling in Regulation (EC) No 561/2006 caps a single-manned tractor near 145,000 km a year and almost no fleet achieves it — our arithmetic, worked through in what a tractor unit costs to run — so the 160 000 km threshold falls in the second year of service, not the first. The change-of-keeper trigger makes the purchase itself one of the listed occasions, which is a question to settle alongside the rest of the paperwork when buying a used truck. Note the verb: the authority may require a test, not that one falls due automatically.

What the test covers, and what it deliberately does not

Point 2 of Annex I lists ten inspection areas: identification of the vehicle; braking equipment; steering; visibility; lighting equipment and parts of the electrical system; axles, wheels, tyres, suspension; chassis and chassis attachments; other equipment; nuisance; and supplementary tests for passenger-carrying vehicles of categories M2 and M3. That last area applies to buses and coaches only and runs to twelve sub-headings, several marked (X) — Annex I’s tag for items not essential in a roadworthiness test, and where the accessibility equipment inspected under item 9.11 sits.

The boundary of the exercise is one sentence in Article 6(2): tests are carried out using techniques and equipment currently available, without the use of tools to dismantle or remove any part of the vehicle. A roadworthiness test is a condition assessment, not a strip-down, and no certificate should be read as one. The data needed to get a vehicle ready for it is covered elsewhere: Article 3(48) of Regulation (EU) 2018/858 puts preparing a vehicle for roadworthiness testing inside the definition of repair and maintenance information, and Article 3(45) counts operators offering inspection and testing services as independent operators, so both can claim access to the manufacturer’s information.

Braking carries the hard numbers. Item 1.2.2 measures the braking ratio against the maximum authorised mass — or, for semi-trailers, against the sum of the authorised axle loads.

Minimum service braking efficiency — Directive 2014/45/EU, Annex I item 1.2.2, with the Annex’s own footnote markers.
Category	Registered after 1/1/2012	Registered before 1/1/2012
M1	58 %	50 % (3)
M2, M3	50 %	50 % (3)
N1	50 %	45 %
N2, N3	50 %	43 % (4)
O2, O3, O4 — semi-trailers	45 % (2)	40 % (5)
O2, O3, O4 — draw-bar trailers	50 %	40 % (5)

The markers are not decoration. Every pre-2012 cell but N1 carries one, and on the rows a commercial buyer works from — the heavy trucks and the trailers — the footnote, not the cell, holds the operative figure. Footnote (4) reads “45 % for vehicles registered after 1988 or from the date specified in requirements, whichever is the later”, so an N2 or N3 is measured at 45 % and the bare 43 % is reachable only by one registered in or before 1988. Footnote (5) does the same for trailers — “43 % for semi-trailers and draw-bar trailers registered after 1988 or from the date specified in requirements, whichever is the later” — which lifts both 40 % cells to 43 % for anything of that age. Footnote (3) moves the other way, down to 48 % for vehicles not fitted with ABS or type-approved before 1 October 1991, and it covers coaches as well as cars because the Annex prints M1, M2 and M3 on one line. Only footnote (2) belongs to the post-2012 column, dropping the semi-trailer figure to 43 % where the semi-trailer was approved before 1 January 2012. Falling short of the applicable figure is a major deficiency; reaching less than 50 % of it is a dangerous one. Item 1.2.1 then adds a balance test unrelated to the total: braking effort from any wheel below 70 % of the maximum recorded from the other wheel on the same axle is major, and below 50 % on a steered axle it is dangerous. A vehicle can make its overall percentage and still fail on the split.

Minor, major, dangerous — and the escalation rule

Article 7(2) sets three groups, and each of them names the environment alongside safety: minor deficiencies having no significant effect on the safety of the vehicle or impact on the environment, and other minor non-compliances; major deficiencies that may prejudice the safety of the vehicle or have an impact on the environment or put other road users at risk, or other more significant non-compliances; and dangerous deficiencies constituting a direct and immediate risk to road safety or having an impact on the environment which justify a member state or its competent authorities prohibiting the use of the vehicle on public roads. A noise or emissions fault caught under area 8, nuisance, is therefore gradeable in its own right, not only as an appendix to a safety fault.

Article 7(3) then does something most summaries omit. A vehicle with deficiencies in more than one group is classified in the more serious group — but one showing several deficiencies within the same inspection area may be moved up to the next most serious group where their combined effect can be shown to produce a higher risk to road safety.

Article 9 supplies the consequences. Minor only: the test is passed, the deficiencies are to be rectified, and the vehicle is not re-tested. Major: failed, with the subsequent test not later than two months following the initial one. Dangerous: failed, and the authority may decide the vehicle is not to be used on public roads and suspend its authorisation for a limited period, without a new registration process, until the deficiencies are rectified and a new certificate issued.

The certificate, and what it actually proves

Annex II fixes the minimum content, and four of its ten items are what a buyer works with: the odometer reading at the time of the test, if available; the identified deficiencies with their severity; the result; and the date of the next test or of expiry. Article 10 requires separate proof of a pass showing when the next test is due.

Article 8(6) requires information from the previous test to be made available to inspectors for odometer checking as soon as it is available electronically, and requires manipulation to be punishable. Article 8(5) required testing centres to file certificate information electronically with the competent authority from 20 May 2018, at the latest by 20 May 2021, and sets the retention period at not less than 36 months. Article 8(3) obliges recognition of another member state’s certificate on re-registration where it is still valid against the receiving state’s intervals; Article 8(4) obliges recognition, as a matter of principle, when ownership changes.

So the file is reconstructable and the mileage line auditable. What no certificate describes is the vehicle beyond the day it was issued — which is why the checks in buying a used coach reach further than area 9 does.

What actually happens at the roadside

Article 2(1) of Directive 2014/47/EU is a list of four lettered points, and the lettering earns its keep further down: (a) M2 and M3, (b) N2 and N3, (c) O3 and O4, (d) the commercial wheeled tractors T1b to T4.3b. Article 2(2) preserves a member state’s right to inspect vehicles outside that scope, such as N1 vans. Article 5(1) then sets the volume, and it sets it for points (a), (b) and (c) alone: in every calendar year the total number of initial technical roadside inspections across the Union is to correspond to at least 5 % of the M2, M3, N2, N3, O3 and O4 vehicles registered in the member states. The point (d) tractors are inside the Directive but outside that denominator. Article 9 sets who gets picked — as a priority, vehicles operated by undertakings with a high-risk profile; otherwise randomly, or on suspicion of a risk to road safety or the environment.

Article 10(1) defines the initial inspection. The inspector checks the latest roadworthiness certificate and roadside inspection report kept on board under Article 7(1), makes a visual assessment of technical condition, may assess cargo securing under Article 13, and may carry out technical checks by any method deemed appropriate — also verifying whether deficiencies noted in the previous roadside report have been rectified. Then comes the clause that rewards keeping paperwork in the cab. Under Article 10(4), where the certificate or a roadside report shows that an Annex II item was inspected in the preceding three months, the inspector shall not check that item, except where an obvious deficiency justifies it.

If it escalates, Article 11 puts the more detailed inspection in a mobile unit, a designated roadside facility or a testing centre, and Article 12 applies the same severity groups and escalation rule. Article 14 requires any major or dangerous deficiency to be rectified before further use on public roads, and for a direct and immediate risk use is restricted or prohibited, with movement permitted only to reach one of the closest workshops. Article 15 allows a reasonable fee where a detailed inspection finds deficiencies, and Article 16 gives the driver a copy of the report while the authority keeps the results for not less than 36 months.

The score that decides how often you are stopped

Here an inspection result stops being an event and becomes a running cost. Article 6 of Directive 2014/47/EU requires the number and severity of deficiencies found on the point (a) to (c) vehicles operated by individual undertakings — the same categories the 5 % quota counts — to be entered into the risk rating system established under Article 9 of Directive 2006/22/EC, and states plainly that the information is used to check undertakings with a high risk rating more closely and more often. Member states apply that from 20 May 2019 under Article 26.

Two weighting schemes meet in that register, and they are not the same scheme.

Annex I of Directive 2014/47/EU sets out criteria a member state may use on the vehicle side: severity factors of 40 for a dangerous deficiency, 10 for a major and 1 for a minor; time factors of 3 for the last 12 months, 2 for months 13 to 24 and 1 for months 25 to 36; and a classification performed so that the distribution within the listed undertakings comes out as under 30 % low risk, 30–80 % medium risk and above 80 % high risk. Article 6 also allows voluntary roadworthiness tests to count towards improving a profile.

The social-legislation side is neither optional nor weighted the same way. Article 9 of Directive 2006/22/EC bases the rating on infringements of Regulation (EC) No 561/2006, Regulation (EU) No 165/2014 and national law transposing Directive 2002/15/EC, and Commission Implementing Regulation (EU) 2022/695 lays down the common formula: 1 point for a minor infringement, 10 for a serious, 30 for a very serious and 90 for a most serious, counted over two years, with operators falling into a grey band if never checked, green at 0–100 points, amber at 101–200 and red at 201 or more. Point 7 records checks finding no infringement at zero and point 6 counts them in the total number of checks, so a clean check genuinely dilutes an old bad one. Point 10 multiplies the final score by 0.9 where a check at the premises establishes that the whole fleet carries the smart tachograph under Chapter II of Regulation (EU) No 165/2014.

For anyone modelling what a tractor unit costs to run, that is how maintenance discipline turns into fewer stops, fewer detailed inspections and fewer Article 15 fees.

The package is under revision

The Commission tabled COM(2025) 180 final on 24 April 2025, amending both directives under procedure 2025/0097(COD). The Council’s position of 4 December 2025 keeps the current scope and minimum test frequencies and brings light commercial vehicles into a roadside inspection system that is, in the Legislative Train’s wording, currently focused on vehicles above 3.5 tonnes — focused, not confined, since Article 2(1)(a) already catches M2 and M3 by seating count with no mass threshold at all. Parliament confirmed its mandate on 21 May 2026 by 369 votes to 126 with 84 abstentions, and negotiations opened on 2 July 2026. The unresolved point is the interval for vehicles over ten years old — a question about cars and vans, not about the heavy annual cycle.