Across the UK, 20 mph speed limits are becoming increasingly common. Local authorities are introducing them in towns, cities, and even rural areas as part of wider efforts to improve road safety, reduce emissions, and create calmer streets for residents and cyclists. While the intentions behind these changes are understandable, the reality for classic car owners is far from straightforward.
For those who cherish older vehicles – whether it’s a lovingly restored Jaguar E-Type, an MGB, or a Triumph Bonneville motorcycle – the new restrictions present some very practical and mechanical challenges. Unlike modern cars, classic vehicles were not designed for sustained low-speed driving, and the impact of these new limits is being felt across the enthusiast community.
One of the most common frustrations among classic car drivers is gear selection at low speeds. Many older cars feature manual gearboxes with wider gear ratios than their modern counterparts. At 20 mph, drivers often find themselves between gears – second can feel too low, while third causes the engine to strain or stutter.
This creates what many describe as “lumpy” or “juddery” driving, particularly noticeable in older engines with less refined carburettor systems. Holding a steady 20 mph can therefore be a balancing act, requiring careful clutch control and frequent adjustments to avoid stalling or over-revving. Over time, this kind of stop-start driving adds unnecessary wear to the clutch, gearbox, and drivetrain components.
For drivers used to the flowing rhythm of open-road motoring, these lower limits also make journeys feel more laboured and less natural.
Classic engines, especially those tuned for performance, are not designed to run efficiently at very low revs. Many of these engines – from early Minis to big American V8s – are happiest when driven at moderate speeds, where oil pressure, combustion, and cooling are optimal.
At 20 mph, the engine often operates below its most efficient range, causing rough idling, poor fuel combustion, and increased emissions. Some cars may “cough” or “spit” under light throttle, a clear sign that they’re not running smoothly. This doesn’t just make for an uncomfortable drive; it can also lead to fouled spark plugs and fuel wastage over time.
Owners who take pride in maintaining their engines in peak condition find themselves in a difficult position – wanting to comply with the law, but knowing their car simply doesn’t perform at its best at such low speeds.
One of the greatest pleasures of classic car ownership lies in the driving experience itself – the connection between car, driver, and road. Classic cars are wonderfully mechanical, analogue, and engaging to drive. There’s a sensory joy in hearing the engine note rise, feeling the gears engage, and guiding a machine built for enjoyment rather than efficiency.
However, 20 mph limits demand constant monitoring of the speedometer, forcing drivers to keep one eye on the dial instead of the scenery. The experience becomes less immersive, more constrained, and in many cases, more stressful.
Classic motorcycling enthusiasts face similar frustrations. Many older bikes struggle to maintain a consistent low speed without clutch slip, leading to overheating and mechanical strain. The pure, open-road enjoyment that defines the hobby can feel diminished when restricted to a crawl through once-familiar routes.
Many classic car owners also express concern about the practicality of blanket 20 mph limits. While they may make sense in heavily populated residential areas or around schools, applying them universally – including on open roads that were previously 30 or 40 mph – can feel excessive.
Classic cars, by nature, require momentum for smooth operation. Forcing them to travel at artificially low speeds not only affects drivability but can make them appear sluggish or obstructive to other traffic. For enthusiasts who take pride in both the preservation and responsible use of their vehicles, this perception can be frustrating.
It’s important to note that classic cars are not exempt from 20 mph limits. All vehicles, regardless of age, are required by law to comply with posted speed limits. The only exemptions that apply to older vehicles relate to Vehicle Excise Duty (road tax) and, in some cases, MOT testing for vehicles over 40 years old that have not been substantially modified.
In terms of speed regulations, a classic car is treated no differently to a brand-new vehicle. This means that even if maintaining 20 mph is mechanically awkward, drivers must still adhere to the law or risk penalties.
The only area where classic vehicles are treated differently is in relation to speed limiters. Since July 2024, all new cars sold in the UK and EU must include Intelligent Speed Assistance (ISA) systems that automatically help drivers stay within limits. However, there is no requirement to retrofit such systems to older or classic vehicles.
For enthusiasts, adapting to this new driving landscape requires a conscious change in style and awareness. Some useful strategies include:
Classic car owners are, by nature, passionate and resourceful. While the 20 mph limits pose new challenges, many are finding ways to adapt while still enjoying their vehicles responsibly.
Driving at lower speeds for extended periods can place unfamiliar demands on your classic car or motorcycle. Issues such as clutch wear, carburettor fouling, and overheating can arise if vehicles are frequently operated outside their ideal performance range.
This makes regular maintenance and inspection more important than ever. Ensuring that your car or bike is in perfect condition will help mitigate some of these problems and keep it running smoothly, whatever the speed limit.
At White’s Bodyworks in West Sussex, we understand the needs of classic vehicle owners. From panel repairs and precision paintwork to full restorations and detailing, our team treats every project with the care and craftsmanship it deserves. We know how important these vehicles are to their owners – they’re not just transport; they’re passion projects, works of art, and pieces of history.
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