traffic calming devices, traffic calming products, speed table, speed cushions, speed bump vs speed hump, types of traffic calming

Guide

Traffic calming devices compared

Q: What is the most effective traffic calming device for a parking lot?

A bolt-down rubber speed bump. At 2–3 in tall with 12–15 in of travel it enforces 5–10 mph, costs $260–$660 per 12 ft lane, installs in 30 minutes and needs no permit on private property. Humps, tables and cushions are public-street devices that require municipal approval and poured construction.

Q: What is the difference between a speed bump, hump, table and cushion?

Length is what changes the target speed. A bump is 12–15 in long and forces 5–10 mph. A hump is 10–14 ft long for 15–20 mph. A table is 22 ft+ with a flat top for 25–30 mph. A cushion is split into pads so fire trucks and buses straddle it while cars slow to 15–20 mph.

Q: Do traffic calming devices need a permit?

On private property — parking lots, HOA private roads, campuses, warehouse yards, driveways — no permit is required. Anything installed in a public right-of-way needs municipal approval, an engineering study in most cities, and MUTCD-compliant signage.

Q: Which device do fire departments accept?

Speed cushions on public routes, because the pad gaps let wide fire apparatus pass at speed. On private property the standard answer is a bump placed outside the fire lane's required clear width, signed with MUTCD W17-1.

Q: What is the cheapest traffic calming device that actually works?

A bolt-down rubber speed bump: about $22–$55 per linear foot in materials versus $1,500–$3,000+ for a single poured asphalt hump, and it can be removed or relocated later.

Six devices do almost all traffic calming, and length is what sets the target speed: a speed bump (12–15 in of travel) enforces 5–10 mph, a hump (10–14 ft) 15–20 mph, a table (22 ft+) 25–30 mph, and a cushion 15–20 mph while letting fire apparatus straddle it. On private property — parking lots, HOAs, campuses, yards, driveways — the bolt-down rubber bump is the only one of the six that needs no permit, no contractor and no cure time, at $260–$660 per 12 ft lane.

Corporate campus access lane with a rubber speed bump installed across the drive

Device	Height	Length	Target speed	Typical cost	Permit	Best for
Speed bump	2–4 in	12–15 in travel	5–10 mph	$260–$660 / 12 ft lane	No (private property)	Parking lots, HOAs, driveways, yards
Speed hump	3–4 in	10–14 ft	15–20 mph	$1,500–$3,000+ poured	Yes (public streets)	Residential through-streets
Speed table	3–4 in	22 ft+ flat top	25–30 mph	$3,000–$8,000+	Yes	Collector streets, crossings on flat top
Speed cushion	3–4 in	6–7 ft, split into pads	15–20 mph	$2,000–$6,000+	Yes	Fire and bus routes — wide axles straddle it
Rumble strip	< 1 in	Band of ridges	Alert only	Low	Varies	Warning before a stop or a gate
Chicane / narrowing	n/a (horizontal)	Roadway geometry	15–25 mph	Civil work	Yes	Long straight streets, municipal projects

Choose by site

Commercial parking lot

3" modular rubber bump, ≤ 10 mph, 150–250 ft apart

Parking lot speed bumps →

Warehouse, dock, truck yard

2.4" steel-plate bump, ≤ 6 mph, 176,000 lb rated

Warehouse & dock →

HOA or gated community private road

3" modular bump, ≤ 10 mph, 250–500 ft apart, no permit

HOA speed bumps →

School or campus pickup lane

3" modular bump ahead of the crossing, ADA routes clear

School & campus →

Event, detour, seasonal

Portable kit you deploy and pick back up

Portable & temporary →

Public through-street

Hump, table or cushion poured to city spec — municipal project

Bump vs hump →

Frequently asked

What is the most effective traffic calming device for a parking lot?

A bolt-down rubber speed bump. At 2–3 in tall with 12–15 in of travel it enforces 5–10 mph, costs $260–$660 per 12 ft lane, installs in 30 minutes and needs no permit on private property. Humps, tables and cushions are public-street devices that require municipal approval and poured construction.

What is the difference between a speed bump, hump, table and cushion?

Length is what changes the target speed. A bump is 12–15 in long and forces 5–10 mph. A hump is 10–14 ft long for 15–20 mph. A table is 22 ft+ with a flat top for 25–30 mph. A cushion is split into pads so fire trucks and buses straddle it while cars slow to 15–20 mph.

Do traffic calming devices need a permit?

On private property — parking lots, HOA private roads, campuses, warehouse yards, driveways — no permit is required. Anything installed in a public right-of-way needs municipal approval, an engineering study in most cities, and MUTCD-compliant signage.

Which device do fire departments accept?

Speed cushions on public routes, because the pad gaps let wide fire apparatus pass at speed. On private property the standard answer is a bump placed outside the fire lane's required clear width, signed with MUTCD W17-1.

What is the cheapest traffic calming device that actually works?

A bolt-down rubber speed bump: about $22–$55 per linear foot in materials versus $1,500–$3,000+ for a single poured asphalt hump, and it can be removed or relocated later.

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