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Guide

12 minUpdated 2026-08-31 · Reviewed by LT Plastics Engineering

Speed Bump Installation: Step-by-Step Spec and Hardware Guide

The complete installation specification for rubber speed bumps: anchor selection by surface, torque and bolt length, spacing and design speed, ADA route rules, and inspection.

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TL;DR: Rubber speed bump installation is a four-step job: mark the lane and confirm it does not cross an ADA accessible route, drill to the anchor manufacturer's depth, set the correct anchor for the surface (lag screws with shields in asphalt, expansion or wedge anchors in concrete), and torque every fastener to spec. A two-lane crossing takes about 30 to 60 minutes with two people and no lane closure beyond the work zone.

Quick Facts

Item	Asphalt	Concrete
Anchor type	Lag screw with expansion shield or spike	Wedge / sleeve expansion anchor
Typical fastener	1/2 in x 4 to 6 in lag	1/2 in x 3.5 to 4.5 in expansion
Drill	Rotary hammer, carbide bit	Rotary hammer, carbide bit
Hole depth	Anchor length plus about 1/2 in for debris	Anchor embedment plus about 1/2 in
Torque	Per anchor manufacturer; snug plus quarter turn	Per anchor manufacturer, typically 30 to 60 ft-lb
Crew and time	2 people, 30 to 60 min per crossing	2 people, 45 to 75 min per crossing
Cure / traffic	Immediate	Immediate
Temperature	Above 40 F preferred for asphalt integrity	Any workable temperature

Product ratings, unchanged: 2.4 in heavy-duty oval for design speeds up to 10 mph; 3 in modular strip for design speeds up to 5 mph. Ships nationwide and to Mexico.

Step 1: Layout and Lane Measurement

Measure the paved width at the crossing point, curb face to curb face or edge to edge.

Decide whether the crossing is full-width or leaves a drainage gap at the gutter line. Most sites leave a gap so stormwater still runs along the curb.

Count modules or sections for the measured width, including end caps. Our lane-width kit configurator does this count automatically for both profiles.

Chalk the centerline and the leading edge. Check the line is square to traffic — an angled bump steers vehicles and wears unevenly.

Dry-lay the sections and mark every anchor hole through the factory holes before drilling anything.

Never scale anchor positions off a drawing. Mark through the product.

Step 2: Confirm You Are Not Blocking an ADA Accessible Route

This is the step skipped most often and the one with legal exposure. Under the 2010 ADA Standards, an accessible route connecting accessible parking to an entrance must remain continuous, and running slope and cross slope are limited. A speed bump placed across that route creates a vertical change in level that the route cannot legally have.

Practical rules:

Do not place a bump across a marked pedestrian crossing that forms part of the accessible route.

Do not place a bump within an accessible parking space or its adjacent access aisle.

Where a bump must sit near an accessible route, route pedestrians around it with marked crossings and keep the route surface continuous.

Keep vertical changes in level on the accessible route within the standard's limits; a speed bump is not a compliant change in level.

Our parking lot traffic safety compliance guide covers the ADA route interaction, spacing and multi-site rollout in full.

Step 3: Drill and Anchor by Surface

Asphalt

Asphalt is a flexible pavement; fasteners work loose if the anchor relies on friction alone.

Use a lag screw with an expansion shield, or a purpose-made asphalt spike.

Drill the hole diameter specified for the shield, not for the bolt.

Drill deeper than the anchor by about half an inch so drilling debris does not bottom the fastener out.

Blow or vacuum the hole clean. Debris is the single largest cause of anchors that back out within weeks.

In hot weather, asphalt softens and anchors can be over-torqued into a spinning hole. Snug, then a quarter turn, then stop.

Concrete

Use wedge or sleeve expansion anchors sized to the product's hole diameter.

Respect minimum embedment depth and minimum edge distance from the anchor manufacturer. Anchoring too near a slab edge or joint spalls the concrete.

Never anchor across a control joint or expansion joint. Slab movement will shear the fastener.

Torque to the anchor manufacturer's figure with a torque wrench, not by feel.

Both surfaces

Install fasteners from the center of the device outward so the sections stay aligned.

Set fastener heads flush or slightly recessed into the molded pocket. A protruding head is struck by every snowplow, sweeper and tire that crosses it.

Re-torque every fastener after the first week of traffic. This one step prevents most first-year loosening callbacks.

Step 4: Signage, Markings and Handover

Advance warning signage per FHWA MUTCD practice, placed so drivers have slowing distance before the device.

Reflective markings or factory-molded reflective inserts for night visibility.

Pavement markings on the approach where site speeds are higher.

Post the design speed. A device rated for 5 mph installed where drivers travel 20 mph will be damaged and will damage vehicles.

Spacing and Design Speed

Spacing controls average speed between devices. Bumps set too far apart let drivers accelerate and brake, which is louder, harder on vehicles and less effective than a tighter series.

Target average speed	Typical spacing between devices
5 mph	100 to 150 ft
10 mph	150 to 250 ft
15 to 20 mph	250 to 350 ft

Match device to purpose: a 2.4 in heavy-duty profile for mixed commercial traffic and delivery vehicles at up to 10 mph, and a 3 in modular strip where the design speed is 5 mph or less, such as driveways, HOA lanes and pedestrian-heavy yards. See heavy-duty speed bumps and portable speed bumps for the profiles, and the speed bump vs hump vs table comparison for the device-class decision.

Site-Type Specification

Site	Device	Notes
Retail parking lot	2.4 in heavy-duty	Keep clear of accessible routes and aisles
Distribution yard	2.4 in heavy-duty	Full lane width, re-torque quarterly
Corporate or school campus	2.4 in heavy-duty	Pair with marked crossings
HOA and residential lanes	3 in modular	5 mph design speed, high signage visibility
Private driveway	3 in modular	Leave a drainage gap at the edge
Temporary work zone or event	Portable / modular	Remove and reinstall; carry spare hardware

Inspection and Maintenance Checklist

Week 1: re-torque all fasteners.

Monthly: visual check for missing or raised fastener heads.

Quarterly: torque check in high-traffic yards; inspect leading edges for delamination.

After snow season: inspect for plow damage, replace missing end caps.

Annually: verify signage is intact and legible, verify markings, re-verify that no route has been re-striped into an ADA conflict.

Keep a photo record per crossing. On multi-site rollouts, a standard installation sheet per site — lane width, module count, anchor type, torque, photos — is what makes the twentieth site as clean as the first.

> Have lane widths and site count? Send them and get a per-site kit quote in 24 hours. Ships nationwide and to Mexico.

FAQ

How do you install a speed bump on asphalt?

Mark the lane and the anchor holes through the product, drill with a rotary hammer to the anchor's specified depth plus about half an inch, clean the hole, set lag screws with expansion shields or asphalt spikes, then torque from the center outward and re-torque after the first week.

What anchors are used for speed bumps in concrete?

Wedge or sleeve expansion anchors sized to the product's hole diameter, installed at the manufacturer's minimum embedment and edge distance, never across a control or expansion joint.

How long does it take to install a speed bump?

About 30 to 60 minutes for a two-lane asphalt crossing with two people, and 45 to 75 minutes in concrete. Traffic can cross immediately; there is no cure time.

How far apart should speed bumps be placed?

Roughly 100 to 150 ft for a 5 mph target average speed and 150 to 250 ft for 10 mph. Wider spacing lets drivers accelerate between devices and reduces effectiveness.

Can a speed bump block an ADA accessible route?

No. An accessible route connecting accessible parking to the entrance must remain continuous and within the 2010 ADA Standards' slope and level-change limits. Place devices outside that route and mark pedestrian crossings around them.

Do speed bumps need to be removed for snow plowing?

Modular rubber devices with flush or recessed fastener heads generally survive plowing, but plow damage is the leading cause of end-cap loss. Inspect after snow season and keep spare end caps and hardware on hand.

What speed is each profile rated for?

The 2.4 in heavy-duty oval profile is specified for design speeds up to 10 mph. The 3 in modular strip is specified for design speeds up to 5 mph.

Sources

US Department of Justice, 2010 ADA Standards for Accessible Design — Sections 206 and 502 (accessible routes, parking)

FHWA Manual on Uniform Traffic Control Devices (MUTCD), Part 2 — Warning signs and traffic calming

FHWA Traffic Calming ePrimer — device spacing and design speed

ITE Traffic Calming: State of the Practice — spacing and speed relationships

Anchor manufacturer published embedment and torque specifications

Next Read

Speed bump quote checklist

Next step in your decisionSpeed Bump Quote Checklist: What to Measure Before You Ask for Price

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