Speed Bump vs Speed Hump vs Speed Table: US Guide

TL;DR: A speed bump is short in the direction of travel; a speed hump spreads the rise over a longer distance. A speed table adds a flat top, while speed cushions leave gaps intended for certain wider vehicles. Choose by the complete profile, traffic mix and site approval—not height alone. None guarantees a safe crossing speed for every vehicle.

Quick Facts

FHWA describes typical speed humps as approximately 12 feet long and speed tables as approximately 22 feet long. These are reference geometries, not universal requirements or specifications for LT Plastics products. Use the approved drawing for your site.

The distinction buyers miss: travel length is not lane width

The length a vehicle drives over controls the shape of its rise and fall. The width across the lane controls coverage. Adding more modules across a lane does not turn a short bump into a long-profile hump. A seller's label is not a substitute for a dimensioned drawing showing both directions.

Ask for height, travel length, ramp shape and width across the lane before comparing prices. Two devices with the same height can feel very different under a loaded vehicle.

Start with the site problem, not a product name

A pedestrian conflict near a dock or gate

Identify where drivers need to slow before the conflict. Check sight lines, turning paths and the interaction of trucks, forklifts and pedestrians. A bump is only one measure: pedestrian separation, operating procedures, signs and visibility still matter. Do not place a device where a vehicle must brake sharply while turning or where it disrupts a designated pedestrian route.

A longer private road or neighborhood street

A localized low-speed bump and an engineered series of humps serve different purposes. Before choosing a series, ask a qualified designer or the road authority about spacing, gradients, drainage, access and desired operating speeds. Do not copy one spacing figure from a parking lot into a street project.

A fire, ambulance or bus route

Cushions may allow some wide-track vehicles to pass between pads, but the actual wheel tracks must match the layout. A table is not automatically jolt-free. Consult the relevant fleet operator and fire authority before specifying either option; do not promise uninterrupted emergency access from a generic diagram.

How the LT Plastics models fit into this comparison

LT Plastics offers rubber profiles marketed at 2.4 inches and 3 inches. Compare their current drawings and installation instructions through Site & Traffic Safety. Neither the height nor the word “modular” establishes that a device is an engineered street hump, table or cushion.

For an industrial site, send lane dimensions, pavement type, vehicle types and loaded operating conditions. Confirm current model suitability, hardware and crossing instructions before ordering. We do not list humps, tables or cushions here as interchangeable substitutes for those two profiles.

When not to buy a bolt-down bump yet

Private ownership does not remove the need to check local requirements. Obtain the owner's permission and confirm any applicable permit, accessibility and emergency-access obligations. The ADA accessible-route requirements are separate from a device's marketing description.

A useful request for evaluation

Prepare a lane plan or photos, widths in feet, pavement construction, traffic direction, vehicle mix, conflict locations and number of sites. Record whether trucks cross loaded, whether forklifts use the route and whether emergency access is designated. This allows a meaningful discussion of suitability and installed scope instead of a quote based only on height.

For the next practical checks, use the installation specification and hardware guide, loading-dock traffic control guide and loose or cracked bump troubleshooting guide.

FAQ

What is the difference between a speed bump and a speed hump?

A bump is shorter in the direction of travel and produces a more abrupt rise and fall. A hump spreads that rise over a longer profile. Height alone cannot establish which device you are buying; compare the full drawing and intended application.

How do speed cushions compare with speed bumps?

Cushions use separated pads and gaps intended to accommodate certain wider wheel tracks. A continuous bump crosses the lane without those vehicle-specific gaps. Cushion suitability depends on the real emergency or transit vehicles, not merely their size.

Can I make a speed hump by adding bump modules?

Adding modules across the lane increases width, not travel length. Only a design with the required longer profile and suitable ramps is a hump. Confirm the dimensioned drawing rather than relying on the label.

Can speed bumps damage vehicles?

Ground clearance, wheelbase, loading, device geometry and crossing speed all matter. Do not assume a rubber device makes every crossing safe. Follow the manufacturer instructions and have low-clearance or unusual vehicles assessed before installation.

Are permits unnecessary on private property?

No universal exemption applies. Check the owner, local jurisdiction and relevant fire or accessibility requirements before installation. A public-road installation requires the appropriate road authority's approval.

Sources

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