If you run a van fleet, here is the number that should be pinned to the office wall: during targeted DVSA roadside checks, 83.9% of light goods vehicles given a prohibition were prohibited for being overloaded. Not brakes. Not tyres - though tyre condition accounts for another 26.2% of prohibitions for mechanical defects. Overloading. It is the single most common reason a van gets taken off the road, and it is entirely self-inflicted.
This guide explains why van overloading is so widespread, what it costs when you are caught, and the straightforward controls that stop it.
Vans suffer from a structural problem trucks do not: nobody weighs them. A 44-tonne artic passes over weighbridges and gets loaded against a manifest; a 3.5-tonne van gets filled by eye, often by people with no idea what the vehicle is rated to carry. Parcel work, builders’ merchants runs, tool-and-equipment loads - the weight creeps up item by item, and the driver setting off at 7am has no reliable sense of where the total sits.
The legal limit is not a mystery, though. Every van has a design gross weight - the maximum weight your van can weigh when it is loaded, sometimes called the gross vehicle weight or laden weight. It is on the vehicle identification number (VIN) plate in the van. The design gross weight is the total combined weight of the van itself, fuel, the driver and passengers, and everything being carried. You must not load beyond it - full stop.
The police and DVSA have the power to carry out spot checks on your vehicles and issue prohibitions if necessary, and a prohibition prevents your drivers from driving until you get the problem fixed. As part of targeted roadside checks, DVSA stops around 15,600 vans each year. DVSA estimates that being stopped can cost owners and operators up to £4,000 per day, per vehicle.
Put your own numbers against that. A van on a multi-drop round might generate a few hundred pounds of margin in a day. One overloaded van, one roadside stop, and the week’s profit on that vehicle is gone - before you count the rescheduled deliveries, the customer apologies and the management time. Overloading is not a shortcut to productivity; it is a lottery ticket with terrible odds.
Weight touches more than the roadside stop. The same fleet guidance ties vehicle condition and legality together: your vans must always be insured, taxed and MOT’d, and the process documented. Vans up to 3,500kg design gross weight need an MOT every year once they reach 3 years old - class 4 for goods vehicles up to 3,000kg (car-type vans) and class 7 for goods vehicles over 3,000kg up to 3,500kg. And weight decides whether you need an operator licence at all: you need a goods vehicle operator’s licence if your business uses vans with a design gross weight over 3,500kg, or an unladen weight over 1,525kg where there is no plated weight.
That last threshold matters to growing businesses. The moment your fleet moves up to bigger vans, you may cross into operator licensing - with its maintenance records, walkaround checks and financial standing requirements - whether you feel like a “proper haulier” or not.
The second-place prohibition cause deserves attention because it is usually a symptom of the first. Overloaded vans destroy tyres: excess weight overheats them, accelerates wear and raises the risk of a blowout. Condition of tyres accounts for 26.2% of the mechanical defects behind light goods vehicle prohibitions. If your fleet is chewing through tyres faster than expected, check the loads before blaming the rubber - chronic overloading often announces itself through the tyre bill first.
The fix is procedural, not expensive:
Eighty-four per cent of van prohibitions being weight-related is not an enforcement statistic - it is a management statistic. The vans that get prohibited belong to businesses that never told their drivers what the limit was, never weighed a load and never checked. Weigh once, label the limit, check daily, and your fleet drops out of the easiest prohibition category there is.