PCV Vehicle Weights and Dimensions 2 — Questions and Answers

Question 1: What is the maximum width permitted for a bus or coach in the UK?

2.3 metres
2.55 metres (Correct answer)
2.75 metres
3.0 metres

Correct answer: 2.55 metres

The maximum permitted width for a bus or coach in the UK is 2.55 metres (approximately 8 feet 4 inches). This limit ensures vehicles can safely navigate standard road widths and pass oncoming traffic.

Under the Road Vehicles (Construction and Use) Regulations, the maximum permitted width for a PCV is 2.55 metres. This dimension does not include mirrors or other specified projections. Knowing your vehicle's exact width is essential when navigating narrow roads, passing parked cars, approaching width restrictions, and using narrow lanes in towns and villages. Some older roads and bridges in the UK are narrower than modern standards, making width awareness particularly important for PCV drivers. If a width restriction sign shows a measurement less than your vehicle's width, you must find an alternative route.

Question 2: What is the maximum overall length of a single-decker rigid bus in the UK?

10 metres
12 metres (Correct answer)
13.5 metres
15 metres

Correct answer: 12 metres

The maximum overall length for a single-decker rigid bus is 12 metres. Articulated (bendy) buses may be longer, up to 18.75 metres, but standard rigid buses must not exceed 12 metres.

UK regulations set the maximum length for a rigid bus at 12 metres. This dimension is important for route planning, particularly when considering turning circles at roundabouts, junctions, and bus stations. The length also affects how much space is needed at bus stops and determines whether the vehicle can safely navigate certain streets. Articulated buses can be up to 18.75 metres, and double-deck buses are also limited to 12 metres for rigid vehicles. Drivers must know their vehicle's exact length to judge whether they can safely complete turns, fit into parking spaces, and avoid overhanging at junctions.

Question 3: Why is it important to know the unladen weight of your PCV?

To calculate fuel consumption only
To determine the maximum number of passengers you can carry (Correct answer)
To calculate road tax
To choose the correct engine oil

Correct answer: To determine the maximum number of passengers you can carry

Knowing the unladen weight allows you to calculate how much payload (passengers and luggage) you can carry before reaching the maximum gross vehicle weight. This prevents overloading.

The unladen weight is the weight of the vehicle without passengers, luggage, or fuel (though sometimes with a standard fuel load). By subtracting the unladen weight from the maximum gross vehicle weight shown on the vehicle's plate, you can determine the maximum payload capacity. For a PCV, this payload includes passengers (typically calculated at 63.5 kg per person in the UK), their luggage, and any other items carried. This calculation is essential to prevent overloading, which is a criminal offence and affects braking, steering, tyre wear, and overall vehicle safety.

Question 4: What is the maximum permitted height for a double-decker bus in the UK?

4.0 metres
4.38 metres
4.57 metres (Correct answer)
5.0 metres

Correct answer: 4.57 metres

The maximum permitted height for a double-decker bus in the UK is 4.57 metres (approximately 15 feet). Drivers must know their vehicle's exact height and be alert for low bridges.

The 4.57-metre (15-foot) height limit for double-decker buses is set by Construction and Use regulations. This measurement is particularly critical because bridge strikes involving double-decker buses can cause catastrophic injuries to upper-deck passengers. Drivers must memorise their vehicle's exact height, including any roof-mounted equipment. The standard UK rail bridge clearance is 16 feet 6 inches (5.03m), but many older bridges have lower clearances. Height information boards are displayed on all bridges with restricted clearance. Some operators fit height-sensing devices that alert the driver if they approach a low bridge.

Question 5: How does exceeding the maximum axle weight affect a PCV?

Only fuel consumption is affected
It can cause tyre failure and premature suspension wear (Correct answer)
It only matters during MOT testing
It makes the vehicle more stable

Correct answer: It can cause tyre failure and premature suspension wear

Exceeding maximum axle weight can cause tyre failure due to excessive loading, premature wear of suspension components, and reduced braking efficiency on that axle. It also causes accelerated road surface damage.

Each axle on a PCV has a maximum permitted weight specified by the manufacturer and shown on the vehicle's plate. Exceeding these limits puts excessive stress on tyres, which can lead to blowouts — extremely dangerous at speed and particularly with a vehicle full of passengers. The suspension components (springs, shock absorbers, bushings) wear faster under excessive load, leading to poor ride quality and potentially dangerous handling characteristics. Braking efficiency is also reduced because the brake system is designed for loads up to the rated maximum. Additionally, overloaded axles cause disproportionate damage to road surfaces, which is why enforcement officers conduct regular roadside weight checks.

Question 6: What is the standard weight allowance per standing passenger used when calculating PCV loads in the UK?

55 kg
63.5 kg (Correct answer)
75 kg
85 kg

Correct answer: 63.5 kg

The standard weight allowance per passenger in UK PCV calculations is 63.5 kg (approximately 10 stone). This figure is used to calculate total passenger load against the vehicle's weight limits.

The 63.5 kg per passenger figure is used in UK regulations for calculating passenger weights when determining whether a PCV is within its gross vehicle weight limit. This figure represents an average passenger weight and is applied regardless of actual individual weights. When the vehicle is licensed for both seated and standing passengers, each person counts as 63.5 kg. For example, a bus licensed for 70 passengers would have a passenger weight calculation of 70 × 63.5 = 4,445 kg. This, added to the vehicle's unladen weight, luggage, and fuel, must not exceed the gross vehicle weight shown on the vehicle's plate.

PCV Vehicle Weights and Dimensions 2

What is the maximum width permitted for a bus or coach in the UK?