S-Marked Prohibition: What DVSA Means for Van Fleets

An S-marked prohibition from the Driver and Vehicle Standards Agency (DVSA) is not just a "stop and fix" notice. For Great Britain operators, it signals that an examiner thinks a serious roadworthiness defect points to a significant breakdown in maintenance — and a fixed penalty may follow. This article explains what S-marking means for van fleets, when a fixed penalty is likely, and what walkaround evidence helps if you are stopped.

What is an S-marked prohibition?

GOV.UK roadside prohibition guidance says you can get an S-marked prohibition when there is a severe defect, usually because there is a problem with the vehicle's maintenance procedures.

A prohibition can be immediate (do not drive until fixed) or delayed (up to 10 days). An S-marked prohibition can itself be delayed if there is no immediate risk. An immediate S-mark is likely to mean immobilisation until repairs, possible prosecution, and a DVSA follow-up assessment of the operator's maintenance procedures.

When does a fixed penalty follow an S-mark?

DVSA's graduated fixed penalty guidance (updated 29 January 2019) covers immediate roadworthiness prohibitions on vehicles used by a GB operator.

A fixed penalty notice (or, in Scotland, a conditional offer) may be issued if the examiner thinks the defect is serious and shows a significant breakdown of maintenance procedures — the S-marked finding. Examiners look for defects that would have been obvious during the driver's daily walkaround (for example, a tyre defect) or during use (for example, a steering defect).

They also consider whether the defect likely first occurred on the current journey, or whether the driver could not have been aware of it. In those cases the immediate prohibition would not be S-marked and a fixed penalty would not be issued. Roadside prohibition guidance gives the same examples: mid-journey faults and underside defects you could not reasonably have noticed.

Where a significant defect points to poor general maintenance, DVSA says the operator will be visited, maintenance systems checked, and the matter may be reported to the Traffic Commissioner and/or prosecuted.

How much can the fixed penalty be?

GOV.UK states you can be fined between £50 and £300, with court action for more serious cases. DVSA's graduated guidance lists bands of £50, £100, £200 and £300 (band 5 is court prosecution). Some roadworthiness offences also carry penalty points — GOV.UK cites defective brakes as a £100 fine and 3 points. DVSA's van walkaround guidance notes 3 penalty points for each tyre that is not safe and legal.

What walkaround evidence should fleets keep?

DVSA's van guidance says you should record and report defects found on the daily walkaround (and during the journey) if you drive for a business with an operator licence. Record vehicle identity, date, defect details, your assessment, your name and who it was reported to — and record nil defects if you find none. DVSA can ask for that walkaround record at a roadside stop.

The Guide to Maintaining Roadworthiness (updated 28 April 2025) says at least one walkaround check should be carried out in every 24-hour period the vehicle is in service, that defect reports with rectification detail must be kept for at least 15 months, and that nil-defect reporting is good practice. That trail matters when an examiner decides whether a visible tyre fault should already have been spotted — the same judgement behind S-marking. See preparing for a DVSA roadside check and why nil-defect reports matter.

Day to day, fleets should show a named, dated check (including nil results) for each vehicle used; defect reports with severity and close-out before return to service; and 15-month retention of rectification records where the Guide applies. A structured vehicle check app helps keep timestamped inspections ready when an examiner asks — try the interactive demo on the Fleet Track PRO homepage.

How often do stopped light vans get prohibited?

DVSA's vehicle enforcement data for Great Britain (updated 17 September 2026) shows that for Great Britain LGVs in April to June 2026, examiners issued mechanical prohibitions on 70.75% of mechanical checks (890 from 1,258). These are targeted stops, not a whole-fleet rate. Tyre and lighting faults still dominate related LGV prohibition defect tables — see the 10 most common van defects found by DVSA in 2026.

This article summarises official DVSA and GOV.UK guidance current at the time of writing. It is not legal advice. Always check the latest gov.uk sources for your operation.