Speed Bump Height & Spacing for Parking Lots: 2.4 in vs 3 in
Height and spacing decide whether a parking lot actually slows down: the 2.4 in versus 3 in decision, spacing per drive aisle length, and the drainage and accessibility rules that govern placement.
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TL;DR: A speed bump is short and abrupt — roughly 2 to 4 in tall over 1 to 3 ft of travel — and targets 5-10 mph in parking lots and private drives. A speed hump is 3 to 4 in tall spread over 10 to 14 ft and targets 15-20 mph on public streets. Length, not height alone, sets the speed.
Quick Facts
| Device | Height | Length of travel | Design speed | Typical location |
|---|---|---|---|---|
| Speed bump | 2-4 in | 1-3 ft | 5-10 mph | Parking lots, private drives, alleys |
| Speed hump | 3-4 in | 10-14 ft | 15-20 mph | Residential streets |
| Speed table | 3-4 in | 20-25 ft (flat top) | 25-30 mph | Collector streets, crossings |
| Speed cushion | 3-4 in | 6-10 ft, split lanewise | 15-20 mph | Emergency vehicle routes |
Height Gets the Attention. Length Sets the Speed.
Vertical deflection is what a driver feels, and how sharply they feel it is a function of ramp length. Compress 3 in over 2 ft and a driver must approach at single-digit speed or take a jolt. Spread the same 3 in over 12 ft and 18 mph feels controlled. This is why a "taller bump" is rarely the answer to speeding on a street — a longer hump is. For the full device-by-device comparison see speed bump vs speed hump vs speed table.
Two practical consequences:
Our Two Profiles and What Each Is For
| Model | Height | Rated for | Application |
|---|---|---|---|
| Heavy Duty oval | 2.4 in | Up to 10 mph | Commercial parking lots, warehouse yards, truck aprons |
| Modular strip | 3 in | Up to 5 mph | Loading docks, pedestrian-heavy zones, tight aisles |
The taller modular profile carries the lower rating because its travel length is shorter and its intent is a near-stop. Reading "taller equals faster traffic tolerated" backwards is the single most common specification mistake. Configure by lane width with the lane configurator and see the full installation procedure for hardware and torque.
Spacing: The Rule That Makes or Breaks the Installation
A single device slows traffic at one point and invites acceleration on both sides of it. Spacing determines whether the corridor is actually calmer.
Also fix the approach: a device immediately after a blind curve or crest gives no reaction distance. Keep clear sight distance ahead of every unit and mark it.
Parking Lot Criteria That Are Not About Speed
Which Device for Which Problem
| Problem observed | Device that fits |
|---|---|
| Cars cutting through a parking lot at 20 mph | Speed bumps at aisle intervals plus signage |
| Speeding on a residential street | Speed humps at 250-400 ft |
| Pedestrian crossing needs a slow, level surface | Speed table |
| Route used by fire apparatus | Speed cushions (wheelbase straddle) |
| Temporary work zone or event | Removable modular units |
FAQ
What is the difference between a speed bump and a speed hump?
A speed bump is 2-4 in tall over 1-3 ft of travel for 5-10 mph in parking lots. A speed hump is 3-4 in tall over 10-14 ft for 15-20 mph on streets. The travel length is the real difference.
How tall is a standard speed bump?
Most are 2 to 4 in. Our heavy duty oval is 2.4 in and the modular strip is 3 in; taller is not automatically better because ramp length governs the ride.
What height speed bump do I need for a parking lot?
2.4 in for general commercial traffic at up to 10 mph. Choose the 3 in modular profile only where you want a near-stop, up to 5 mph, such as a loading dock or pedestrian zone.
How far apart should speed bumps be placed?
250-500 ft is common practice on streets; in parking lots place them where a drive aisle exceeds about 150 ft of straight run. Too far apart and drivers regain speed in between.
Do speed bumps damage cars?
A correctly specified and installed device crossed at its rated speed does not. Damage complaints trace to abrupt profiles used at street speeds, loose anchors, or missing signage that prevents drivers from slowing.
Can speed bumps go on an accessible route?
No. Keep vertical devices out of accessible routes and accessible parking aisles, and preserve drainage paths with segmented placement.
Are removable speed bumps as effective?
Yes at their rated speed, provided anchors are correct for the substrate. They are the right choice for plowed lots, leased sites and temporary zones.
Sources
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Part of the topic guide
Speed Bumps for Parking Lots, Truck Yards and Loading Docks