Speed Bumps for Apartment Complexes: 2026 Property-Manager Guide

An apartment-complex speed bump is a parking-lot device, 3 to 3.5 inches tall, installed on private community roads inside a multifamily property to slow tenant, guest, and delivery traffic. Before install you need tenant notice, ADA-pathway preservation, and moving-truck-clearance verification. The FHWA Traffic Calming ePrimer finds multifamily private roads behave like residential streets — same speed-creep — but the pedestrian density is higher (kids, dog walkers, residents loading cars), and that makes engineered speed control pay off harder.

Below: tenant notice, layout strategy, the moving-truck constraint, and a Hillsboro install we ran. HOA-governed communities have a different process — see speed bumps for HOA communities.

Why do apartment complexes need speed bumps?

Apartment complexes concentrate four risk factors:

1. High pedestrian density: residents, children, dog walkers, and delivery couriers move on foot routinely
2. Frequent vehicle turnover: move-in and move-out events bring drivers unfamiliar with the site
3. Late-night traffic: returning shift workers and rideshare drop-offs at hours when most properties have no on-site staff
4. Long straight runs: most multifamily site plans include at least one drive aisle long enough for a driver to accelerate to over-speed

The National Apartment Association reports that slip-and-fall and pedestrian-vehicle incidents are among the top property-liability claim categories at multifamily properties. Engineered traffic-calming -- bumps, painted aisle markings, convex mirrors -- is one of the standard mitigations property insurance carriers and risk-management firms recommend.

What is the tenant-notice requirement?

Oregon's residential landlord-tenant law (ORS Chapter 90) does not specifically address speed-bump installation, but two provisions apply:

1. Common-area access (ORS 90.320)

A landlord must maintain dwelling units and common areas in habitable condition. A speed bump is generally a maintenance or improvement, not a habitability change, so no specific tenant-vote process applies. But a clear notice is best practice.

2. Notice of entry / work (ORS 90.322)

If the install requires temporary closure of a drive aisle, paths, or specific parking spaces, ORS 90.322 requires at least 24-hour written notice to affected tenants. Most Cojo apartment-complex installs use a 7-day notice to give tenants time to coordinate moving plans, delivery schedules, and accessibility needs.

A typical multifamily notice includes:

• Install date and crew-mobilization window
• Affected drive aisles, paths, and parking spaces
• Alternative parking and access routes during the install
• Property-management contact for accessibility accommodations
• Map or aerial showing the planned bump locations

What is the moving-truck-clearance constraint?

Apartment complexes need to accommodate moving trucks (typically Class 3 to Class 5 box trucks, 12 to 26 feet long, with 9 to 11 inches of ground clearance). A standard 3.5-inch parking-lot bump is acceptable for most moving trucks at 5 mph, but two scenarios require attention:

1. Low-clearance moving trucks

Some 26-foot rental trucks have rear-axle compression that reduces ground clearance to 7 to 8 inches under load. A 4-inch bump can catch the rear under-bumper at speed. Solution: keep apartment-complex bumps at 3 to 3.5 inches, never 4.

2. Trailer-towing tenants

Tenants moving with a personal pickup-and-trailer combination experience trailer-tongue compression that can drop the front of the trailer below the bump height during cross. Solution: position bumps on long straight runs, not on tight turns where trailers must crab through.

For tighter ground-clearance scenarios (luxury apartments where many tenants drive lowered or customized vehicles), Cojo specs 2.5-inch low-profile bumps instead of standard 3.5-inch units. The lower profile reduces complaint volume substantially.

Where should bumps go on an apartment site?

Six locations cover most multifamily layouts:

Location	Purpose	Recommended bump
Just inside the gate or main entrance	Sets the tone for the community speed	1 bump, 3 to 3.5 in tall
Long straight drive aisles (over 400 ft)	Prevents acceleration to over-speed	Bumps every 200 to 250 ft
Approach to dumpster enclosures	Slows refuse trucks and tenants dumping trash	1 bump, 3 in tall
Approach to mailbox cluster or community amenity	Pedestrian-vehicle conflict zone	1 bump, 3 in tall
Near building entrances	Slows traffic where pedestrian density is highest	1 bump per row, 3 in tall
Approach to playground or pool gate	Highest-pedestrian-density location	1 bump, 2.5 in tall (low profile)

The most common multifamily mistake is installing too few bumps. A 6-acre property with bumps only at the gate produces a "bump-and-accelerate" pattern. Optimum spacing per ITE Traffic Calming Manual research is 150 to 250 feet apart.

Real install: Cojo at a Hillsboro multifamily property

In September 2025, Cojo installed five rubber speed bumps in a 240-unit Hillsboro apartment complex. The property had two pedestrian-near-miss incidents in the prior 18 months and the property-insurance renewal letter had asked for engineered traffic-calming.

Specification:

• Five 8-foot recycled-rubber bumps, 3 inches tall
• Yellow-and-black pre-molded chevron
• Reflective tape on each bump end
• MUTCD W17-1 "Bump" signs at 100 feet upstream of each bump
• Locations: just inside the gate, before each of three building rows, before the pool entrance
• Total install time: 9 crew-hours
• Tenant notice: 7-day written notice plus door-hangers two days before install
• ADA-pathway verification: each bump location verified to preserve at least one accessible route per ADA Title III to all amenities

Outcome: Property manager reported a measurable reduction in tenant complaints about over-speed traffic. The insurance carrier renewed without premium increase, citing the engineered traffic-calming as a positive factor.

For multifamily property managers in Gresham, Hillsboro, and elsewhere in Portland metro, contact Cojo for a site-specific assessment.

How does an apartment-complex bump comply with ADA?

Federal ADA Title III requires public accommodations and commercial facilities -- which include apartment complexes with leasing offices and amenity buildings open to the public -- to maintain accessible routes from parking to entrances.

Three rules:

1. Bumps must not block accessible parking spaces or van-accessible aisles. Set bumps at least 8 feet beyond an ADA-marked space and never inside a van-accessible aisle.
2. Accessible routes must remain compliant. A bump that crosses a marked accessible route must include a flush 36-inch-wide ADA gap aligned with the route, or the route must be re-routed around the bump.
3. Detectable warning surfaces (truncated domes) are not required at bumps because bumps are not pedestrian-route hazards in the same sense as curb ramps. The chevron-and-reflector marking serves the visibility function.

For ADA pavement-marking specifications applicable to multifamily properties, Cojo's reference is the 2010 ADA Standards for Accessible Design.

What does an apartment-complex install cost?

Industry Baseline Range for multifamily speed-bump installation:

Item	Industry Baseline Range
Rubber bump (6 to 8 ft, installed)	$300 to $900+
Asphalt bump (cast-in-place, installed)	$400 to $1,500+
Low-profile bump (2.5 in for luxury sites)	$350 to $1,000+
MUTCD signage per bump	$150 to $400
Tenant-notice production and door-hanger	$150 to $500
ADA-pathway verification per bump	$100 to $300

These figures reflect published industry averages. Current market pricing varies significantly and actual quotes may fall well outside these ranges based on site-specific conditions, material costs, and project complexity.

Current Market Reality

2026 multifamily install pricing reflects elevated rubber-feedstock costs, prevailing-wage requirements on commercial properties above $25,000 in scope, and added documentation expectations from property-insurance underwriters since the 2024 update of national multifamily-property loss-control standards.