Key Takeaways

  • UK highway advice draws a pretty clear line between speed bumps, speed humps, speed cushions and speed tables – even though most of us just call them all ‘speed bumps’. But getting the terminology right actually matters when you’re talking to your local council about calming traffic in your street.
  • “Road humps” is the formal legal term that covers all of this, according to the Highways (Road Humps) Regulations 1999. Speed humps, cushions and tables are all types of road hump – each one designed for different situations on the road.
  • The basic physical difference is pretty simple: a hump will give you a full on vertical lift across the carriageway; a cushion is a small raised bit with gaps so that big vehicles like buses can just straddle over it; and a speed table is a long flat bit that you’ll normally find at junctions and pedestrian crossings.
  • You’ll most often find these features on roads with 20 mph limits, in residential areas and around schools, and they often come with other traffic calming features like road narrowing and rumble strips to keep drivers moving at a steady pace.
  • Later on, I’ll cover some of the pros and cons, accessibility and cost – and give you tips on how to get the right traffic calming measures put in place on your own road.

Why Traffic Calming Terms Matter in the UK

Ask a few drivers in the pub what that lump in the road is called and you’ll probably get about ten different answers – “speed bump” being the one that crops up most often. And fair enough – in a pub chat that’s probably good enough. But councils, engineers and the law all use much more precise language – road humps, speed cushions, speed tables – and the difference isn’t just in the jargon.

When it comes to traffic calming in the UK, these features are all part of a bigger toolkit of solutions – which also includes road narrowing, build outs, priority lanes and all sorts of road markings and signs. Choose the wrong one, or use the wrong term when you’re talking to your local authority, and it can cause all sorts of confusion.

This article is based on UK rules and practice as it is in 2026 – drawing on the Highways (Road Humps) Regulations 1999, and Local Transport Notes 1/07 and 1/20 (on traffic calming and cycling). I’ll compare each of these devices in terms of what they are, where they are used, their pros and cons, and how they fit into the bigger picture of 20 mph limits and wider traffic calming schemes.

Traffic calming measures are all about slowing drivers down and making our towns and cities safer – so let’s make sure we know exactly what we’re talking about – and what to ask for.

The Legal & Design Background to UK Traffic Calming

Speed bumps, humps, cushions and tables aren’t just random bits of road – they have to fit into a statutory framework and detailed design guidance that dictate everything from how high they can be to who has to be asked before one is put in.

Most of the vertical traffic calming features on the public highway have to follow the Highways (Road Humps) Regulations 1999 – and only the highway authority, or someone working on its behalf, can actually put them in. Local authorities are in charge of cutting traffic speeds down on the roads they look after.

Some key points that councils have to stick to include:

  • A hump can be up to 100 mm high, but a good guide is 75 mm in most schemes.
  • They have to be at least 900 mm long.
  • The drop-off on either side has to be less than 6 mm.
  • You have to ask the police, fire brigade, ambulance and other road users before you put one in.
  • Road humps are normally only allowed on roads with a 30 mph speed limit or less – and speed humps can only be used on roads with a 30 mph or below limit.

The main bits of advice on design come from the LTN 1/07 (Traffic Calming, 2007) which covers vertical and horizontal traffic calming, road narrowings and how to space these things out. LTN 1/20 (Cycle Infrastructure Design, 2020) adds some extra rules for cyclists – including how to design the ramps so cyclists can get over them without any dramas.Its worth noting that in a lot of Europe, 20mph speed limits are pretty common in urban areas – and the UK is slowly moving in that direction too. The difference between a 20mph zone and a 20mph limit is actually quite important – a 20mph zone will generally have physical traffic calming features all over the place, whereas a 20mph limit is usually just sign posted and relies on road markings. What we know is that 20mph zones work loads better when they have actual traffic calming measures in place – just putting up a few speed limit signs can only shave off a couple of mph, whereas proper zones with actual measures can bring speeds right down, by about 9mph. And its pretty clear that these zones often include other safety features too.

What Most Drivers Have Always Called a “Speed Bump” in the UK

Here’s the thing about speed bumps: they aren’t really a proper term in highway engineering – thats just what the man in the street calls it. But in reality its one of those things that can mean different things depending on where you are. In public roads, the thing people call a speed bump is almost always a type of road hump – a sort of regulated feature that is built to last and meets all the highway standards. But the actual “speed bump” you find in supermarket car parks or hospital grounds is a different beast altogether – a smaller, sharper, nastier bump – often with bright paint and warning triangles.

The ones in car parks tend to be smaller, more extreme and not allowed on public roads because they dont meet the UK standards for height and angle, and would be a right pain for emergency vehicles. They arent part of any formal traffic calming schemes on the highway network. On public roads, youd more likely find road humps, speed cushions and speed tables – all properly engineered to work well, and often still referred to as sleeping policemen by the public even though they are a different story altogether.

Speed Bumps (& Humps): The Standard UK Tool For Calming Down Traffic

When UK engineers talk about speed humps, they usually mean proper road humps that stretch right across the road – just what many people still call sleeping policemen. This lot is actually governed by some very strict regulations.

Vertical deflection measures (which is just a posh way of saying they make you go up and down) include speed humps and tables, and the speed hump is the top of the list. Key bits to know about speed humps include:

  • They cover the whole width of the carriageway
  • Typically 75-100mm high
  • The angle is limited to around 1 in 8 to 1 in 10
  • The shape can vary: round tops, flat tops and all that sort of thing
  • They are usually spaced about 60-120m apart in a series – roughly every 100m in 20mph zones

The idea is to physically slow you down, and that is exactly what they do – and they are pretty effective at it too. In terms of actually working, well-spaced humps in residential streets are a proven way to bring traffic speeds right down into the low 20s or below. Research also shows that a 1mph reduction in average speed cuts collision frequency by around 6% – and that lower speeds just correlate with fewer and milder crashes. Traffic calming measures also tend to reduce the severity of those accidents that do happen – which is pretty important when you think about the fact that cars and pedestrians/cyclists are stuck sharing the same space in residential areas.

The Ups and downs of speed humps:

Pros Cons
Strong, reliable speed reduction Noise and vibration for nearby residential properties
Effective in 20 mph zones and outside schools Discomfort for bus passengers if poorly profiled
Low installation cost compared to tables Can cause issues for cyclists and motorcyclists
Encourage drivers to maintain steady slower speeds Marginal increase in emissions from braking/acceleration

Speed Cushions: Letting Big Vehicles Straddle the Hump

Speed cushions take a different approach. Instead of a full-width hump, they consist of a series of raised pads – usually two or three across the lane – with deliberate gaps between them. The idea is that wider vehicles like buses, fire appliances and large ambulances can straddle the cushions, while narrower car drivers must ride directly over them.

Speed cushions allow wider vehicles to pass without obstruction, which is why they’re favoured on bus routes and roads heavily used by emergency services. Typical UK dimensions are:

  • Individual cushion width: around 1.6–1.9 m.
  • Length: 2–3 m.
  • Height: up to 75 mm.
  • Gaps between cushion modules and between cushion and kerb: at least 750 mm.

Speed cushions allow wider vehicles to pass while slowing vehicle traffic – that’s their fundamental selling point. But they come with common criticisms: the speed reduction effect is uneven across different vehicle types, cyclists and motorcyclists can be squeezed into the gaps between cushions, and they’re generally less effective than full-width humps at achieving very low speeds.

Speed cushions are often paired with build outs, priority narrowing or central islands to position vehicles so they can’t easily dodge the cushions. This combination of horizontal deflection and vertical calming tends to produce better results than cushions alone.

Speed Tables: Long, Flat-Topped “Plateaux” for Junctions and Crossings

A speed table is a raised section of carriageway with ramped approaches and a long flat top – think of it as an elongated, gentler version of a speed hump, often spanning a junction, side road or designated pedestrian crossing.

Common layouts in UK streets include raised junctions in 20 mph zones, flat-topped zebra crossings, continuous footway treatments across side-road mouths, and gateway features at village entrances. Speed tables are effective in reducing speeds on residential roads and provide a much smoother ride than sharp humps.

Typical dimensions include ramp lengths of 1.5–2.5 m, plateau lengths of 6–10 m or more, and heights similar to other road humps but with gentler transitions for comfort and accessibility.

The pedestrian benefits are significant. Speed tables provide safer pedestrian crossings at reduced vehicle speeds, offering better visibility, shorter crossing distances when paired with build outs, and integration with tactile paving and contrasting coloured surfacing. Reducing speeds from 30 mph to 20 mph significantly increases the probability of pedestrian survival in a collision – 20 mph zones significantly reduce kinetic energy during impact, which is precisely why tables are placed at crossing points. Physical measures like these improve road safety for vulnerable road users like children and cyclists.

Trade-offs to consider:

  • Higher construction cost than simple humps.
  • Can complicate drainage if not designed carefully.
  • Noise from larger vehicles and vans dropping off the far ramp.
  • But generally smoother for buses, cyclists and wheelchair users than sharp humps.

Where Do Rumble Strips and Other Road Markings Fit In?

Not every calming measure involves raising the road surface. Rumble strips, carriageway roundels, “SLOW” markings, coloured surfacing and visual road narrowings are classed as less intrusive calming measures – they alert drivers without creating full vertical deflection.

Rumble strips are slightly raised strips or textured road markings used mainly on higher-speed approaches to villages, roundabouts or tight bends. Rumble strips alert drivers to reduce speed at high-risk locations. UK practice typically avoids placing them within about 200 m of residential properties because of noise concerns.

Carriageway roundels (painted 20, 30 etc.) and transverse bar markings are low-cost ways to reinforce the speed limit and remind drivers of the posted limit. These surface treatments give car drivers a visual and auditory sense of increasing speed or approaching hazard.

Central hatching, edge lines and ghost islands create the impression of narrow traffic lanes, which encourage more careful driving. These road narrowings work particularly well when combined with physical build outs or pedestrian refuges.

On their own, these tools rarely match the speed reduction achieved by humps, cushions or tables. But they can reduce the number of vertical devices needed in a scheme and improve driver compliance between features – making them a valuable part of any traffic calming toolkit.

Horizontal Deflection, Road Narrowing and Build Outs Alongside Vertical Calming

UK traffic calming schemes rarely use vertical deflection in isolation. Effective traffic calming combines physical engineering and layout changes – and that means pairing humps and cushions with horizontal deflection and road narrowings.

Horizontal deflection measures cause lateral shifts in vehicle travel paths. In plain English, that means forcing vehicles travelling along a road to make a slight sideways movement. This is achieved through:

  • Chicanes – staggered kerb extensions on one or both sides that create an S-shaped path. Chicanes can create breaks in traffic flow to reduce speeds.
  • Build outs (footway build outs or curb extensions) – extensions of the footway into the carriageway. Build-outs narrow roads and improve pedestrian visibility, and can reduce crossing distances for pedestrians.
  • Priority narrowing – where the road narrows to a single lane with give-way signs controlling which direction has right of way. Priority narrowing limits roads to one-way traffic flow at those points.
  • Traffic islands – central refuges that create manageable crossing stages for pedestrians.

Road narrowing can reduce speeds on residential streets by limiting lane widths, making drivers travelling through feel less comfortable at higher speeds. Road narrowing can reduce speeds by limiting lane widths – a simple but surprisingly effective principle.

These measures can reduce the number or harshness of speed humps and speed cushions needed along a route, which is particularly helpful where noise or vibration near residential properties is a concern. However, designers must maintain minimum lane widths (as required by LTN 1/20), avoid squeezing cyclists into narrow gaps beside cushions, and ensure tactile paving and dropped kerbs work properly with build outs.

Choosing Between Bumps, Humps, Cushions and Tables for a Specific Street

It depends. That’s the honest answer, and effective traffic calming requires understanding local conditions and user behaviour before reaching for any particular device.

The right calming measure depends on the specific road safety problems being addressed – existing traffic speeds, the mix of vehicle traffic (percentage of buses, emergency services, commercial vehicles, cyclists), gradient, frontage density and local support. Here are some typical UK choices:

  • Full-width speed humps in quiet residential streets or cul-de-sacs where excessive speeds are the primary concern.
  • Speed tables or raised junctions around schools, busy pedestrian crossings and at junctions where pedestrians and cyclists need priority.
  • Speed cushions on bus routes and emergency response corridors where full-width humps would cause unacceptable delays.
  • Road narrowings with build outs and priority narrowing where the physical layout supports horizontal deflection.

Environmental and amenity factors matter too. Noise and vibration near older residential properties, visual impact in conservation areas, and how coloured surfacing and discreet road markings can soften the look all influence the choice. Parked cars and many private driveways can also constrain where features are placed.

On cost: speed tables generally cost more but tend to be longer-lasting and more accessible. Cushions need careful installation to avoid edge deterioration. Sinusoidal humps often cost more upfront but generate fewer complaints. A combination of lower speed limits, repeater signs, road narrowings, rumble strips and a modest number of well-placed vertical devices usually works better than overloading one street with dozens of humps. Traffic calming can reduce average collision frequency by around 60% in some studies when such measures are well designed and properly combined.

How UK Rules Differ for Public Highways vs Private Roads

There’s an important distinction between the adopted public highway – maintained by the highway authority – and private roads, car parks and driveways, where different rules and liabilities apply.

On the public highway, only the highway authority (or someone acting with its formal consent) may install road humps, speed cushions or speed tables. These must comply with national regulations for height, signing, street lighting and lamp columns.

On private land – supermarket car parks, hospitals, industrial estates – owners often install very sharp speed bumps that wouldn’t be lawful on the public network. These are still subject to general health and safety and occupiers’ liability law, but not the Road Humps Regulations.

On private roads with Public Rights of Way open to motor vehicles, councils may still insist on Road Humps Regulations compliance to protect public safety and prevent unlawful obstructions. And poorly designed bumps – even on private land – can expose owners to claims if they damage vehicles or create hazards for disabled road users, cyclists or motorcyclists.

Approaching, Driving Over and Cycling Across UK Humps and Cushions

Knowing what these features are is one thing. Handling them smoothly is another.

For car drivers:

  • Read terminal signs and repeater signs as you enter a calmed zone.
  • Watch for road markings, warning sign boards and painted triangles on the road surface.
  • Slow in good time and keep a steady low speed over a series of speed humps – avoid harsh braking on the feature itself.
  • At priority narrowing, respect give-way signs and alert drivers travelling from the opposite direction.

For speed cushions and road narrowings:

  • Don’t swerve aggressively to avoid a cushion. It’s designed to slow you, not to be dodged.
  • Give cyclists space where road narrowings and build outs exist – never squeeze past.
  • Where vehicles travelling in a certain direction have priority, wait your turn.

For cyclists:

  • Sinusoidal humps and well-designed speed tables are generally the most comfortable profiles.
  • Badly placed cushions can force you into unsafe positions – LTN 1/20 now steers designers towards more cycle-friendly profiles and, where possible, cycle bypasses.
  • Watch for harsh edges and upstands, particularly on older installations.

For accessibility: Steady slower speeds reduce discomfort for wheelchair users, people with long-term pain conditions and bus passengers. Harsh bumps in car parks can be a particular problem – another reason why highway-compliant features are designed to gentler standards.

How Residents and Parish Councils Can Seek Traffic Calming

You cannot legally install your own road humps or speed cushions on the public highway. But there are clear routes to request traffic management measures from the local authority.

The usual UK process involves:

  1. Reporting speeding concerns via the council website or contacting local councillors directly.
  2. Documenting the problem: count speeds, note locations, log near-misses, map pedestrian desire lines (especially routes to schools).
  3. Feeding into speed management strategies or Local Transport Plan reviews.
  4. Participating in statutory consultations for 20 mph zones or new traffic calming schemes.

Councils typically prioritise locations based on collision history, measured vehicle speeds, proximity to schools or shops, and feasibility for measures like road narrowings, build outs, speed humps or tables.

A parish council can play an active role: commissioning speed surveys, funding village gateway schemes, and investing in vehicle activated signs (VAS). VAS display messages when vehicles exceed set speed limits – they’re often set to trigger at 10% plus 2 mph over the limit. VAS have shown to reduce accidents when implemented effectively, though permanent VAS effectiveness decreases as drivers become familiar with them. Temporary VAS can be moved to maintain driver awareness. Parish councils also fund modest build outs or priority narrowing, often in partnership with the highway authority.

Full schemes can be costly once design, legal orders, lighting changes and drainage are included, so low-cost options such as rumble strips, coloured surfacing and road markings are sometimes offered where budgets are tight.

Looking Ahead: 20 mph Streets and the Future of Vertical Calming in the UK

The expansion of 20 mph speed limits and zones across UK towns and cities is changing the balance between enforcement, design and engineering. Wales has already rolled out a default 20 mph limit in built-up areas, Scotland has followed a similar path, and English cities are running pilots. Where physical calming is present, casualty reductions of 40% or more have been observed over sustained periods.

A 2025 meta-analysis found that 20 mph speed limits reduced crashes overall by roughly 26%, with significantly stronger effects where physical features were included compared to sign-only schemes.

The trend is away from isolated sleeping policemen and towards wider street redesigns: continuous footways, modal filters, Home Zones (which aim to create community-oriented public spaces rather than just reducing speed), Quiet Lanes and low traffic neighbourhoods that use barriers to substantially reduce through traffic. These approaches rely less on harsh bumps and more on changing the fundamental layout and feel of streets.

Technology is playing a larger role too. More vehicle activated signs, speed cameras and smart enforcement are complementing fewer but better-designed humps, cushions and tables. Traffic lights and mini roundabouts continue to manage traffic flow at busier junctions.

There’s growing emphasis on cycling and walking in UK policy, pushing designers towards speed tables, gentler sinusoidal speed humps and clever road narrowings rather than crude, sharp speed bumps. Other measures – from footway build outs to surface treatments – are becoming integral rather than afterthoughts.

While the terminology can be confusing, understanding the differences between bumps, humps, cushions and tables helps communities argue for schemes that are safer, quieter and more comfortable for everyone. The language might seem fussy, but getting it right means better conversations with your council – and, ultimately, better streets.

FAQs

Do speed bumps damage cars if they meet UK standards?

Highway-compliant road humps, speed cushions and speed tables are designed so that vehicles travelling at or below the posted speed limit should not suffer damage. The regulations cap heights at 100 mm and mandate gentle ramp gradients specifically to avoid this. That said, harsh car-park style speed bumps on private land – which don’t have to meet highway standards – can cause suspension or exhaust damage if taken too fast. The rule of thumb: if you’re driving at the intended speed, a properly built feature shouldn’t harm your vehicle.

Are speed cushions legal on a 40 mph road in the UK?

Vertical calming like speed cushions and speed humps is normally restricted to roads with limits of 30 mph or less. In practice, they’re most common in 20 mph zones. Higher-speed roads usually rely on rumble strips, visual road narrowings, vehicle activated signs and signing instead. Speed limits of 30 km/h (approximately 20 mph) are preferred on urban roads where pedestrians and cyclists mix with vehicle traffic, and that’s where physical calming makes the biggest difference.

Can I ask the council to remove existing speed humps or cushions?

Removal is possible but rare. Councils weigh local residents’ petitions, collision data, recorded vehicle speeds, emergency services’ views and scheme costs before deciding whether to modify or remove humps, cushions or tables. If you believe existing features are causing more harm than good – for instance, excessive noise affecting residential properties or demonstrable emergency service delays – document your concerns formally and present them to your local councillor and the highway authority’s traffic team.

What’s the difference between a 20 mph zone and a 20 mph limit?

A 20 mph zone is an area with terminal signs at every entry point and a series of traffic calming features – speed humps, cushions, road narrowings, build outs, speed tables – at regular intervals, so no driver can travel far without encountering one. A 20 mph limit relies mainly on speed limit signs and road markings without requiring physical calming at set intervals. The difference in outcomes is stark: zones with physical measures typically achieve speed reductions of around 9 mph, while sign-only limits manage roughly 1–2 mph on average.

Are there alternatives if local residents dislike vertical traffic calming?

Yes. Options include vehicle activated signs (which alert drivers when they exceed the limit), village gateways with visual narrowing, priority narrowing with build outs, chicanes providing horizontal deflection, rumble strips positioned away from homes, mini roundabouts at junctions, and targeted enforcement campaigns. However, it’s worth being honest: these alternatives may not cut traffic speeds as strongly as well-designed humps or speed tables. Effective calming for a particular street often means combining several of these other measures to compensate for the absence of vertical deflection.

UK Traffic Calming Terms