A school-zone speed bump is a parking-lot device installed in a school's drop-off lane, pickup queue, or staff parking area to keep traffic at 5 mph during student arrival and dismissal. School-zone bumps need a different spec than a retail or HOA bump — bus-clearance, ADA-accessibility, and pedestrian-pathway separation all factor in. The Oregon DOT School Zone Guidance and ITE traffic-calming research both find schools have their worst pedestrian-vehicle conflict rates in the 15 minutes before and after the bell, and engineered traffic-calming measurably cuts those conflicts down.
Below: product selection, school-board approval, bus-clearance considerations, and a Salem-Keizer School District install we ran.
Why do school zones need speed bumps?
The federal National Center for Safe Routes to School reports that 23 percent of all child-pedestrian crashes occur within a quarter-mile of a school during arrival or dismissal hours. Schools concentrate three risk factors that no other facility combines:
- Hundreds of pedestrian children entering and leaving on a 30-minute window
- Hundreds of parent vehicles queuing, idling, and pulling forward
- One or more buses with sight-line obstructions and slow acceleration
A school's marked crosswalk and crossing-guard program addresses the conflict at the curb. A speed bump in the parent drop-off lane addresses the conflict 50 to 100 feet upstream, where parents typically accelerate to leave faster.
According to ITE 2018 field studies, parent-drop-off lanes with installed speed bumps showed average vehicle speeds of 4 to 6 mph during dismissal, compared to 8 to 14 mph at otherwise-identical schools without bumps.
How is a school-zone speed bump different?
Three specification differences set school-zone bumps apart from retail-lot product:
1. Bus-clearance height
A standard parking-lot bump is 3 to 4 inches tall. A school-zone bump in a route used by school buses must be 2.5 to 3 inches tall -- low enough that a Type C school bus (typical clearance: 9 to 11 inches at the rear differential) does not strike the bump at speed when the rear axle compresses on a turn.
The Oregon Department of Education's pupil-transportation specifications and the School Bus Safety Standards (49 CFR Part 571) do not prohibit bumps on bus routes, but bus drivers and district transportation managers prefer either no bump on bus loops or a bump with documented clearance verification.
2. ADA pathway separation
Federal ADA Title II requires that public-school properties provide accessible routes from parking spaces to building entrances that meet the 2010 ADA Standards for Accessible Design. A speed bump installed where a wheelchair or mobility-device user must cross is a barrier. School bumps must:
- Sit outside marked accessible pathways, or
- Include a flush accessible-pathway gap at least 36 inches wide
Cojo's Salem-Keizer install (described below) used a 6-foot rubber bump with a 36-inch flush gap aligned to the painted ADA crosswalk -- a single product modification that solved the pathway-separation requirement.
3. Pickup-queue spacing
Schools with long pickup queues (50 to 200 vehicles) need bumps spaced to slow the queue without stopping it. Place bumps 70 to 100 feet apart -- closer than a typical parking-lot spacing -- because the queuing speed is already slow and the goal is preventing acceleration between bumps, not reducing high-speed travel.
Who approves a speed bump at a school?
Three approvals are typical for an Oregon public school:
1. School-district facilities and operations
Oregon school districts manage capital projects through a facilities or operations division. Cojo's first call on a school project is always to the district's facilities director, not the principal. Districts maintain a master facilities plan that lists allowable site improvements; speed bumps usually qualify as routine maintenance and do not require school-board public-meeting approval.
2. School-board capital-projects review (if applicable)
If a project exceeds the district's small-purchase threshold (typically $25,000 to $100,000 depending on district), it goes to the school board for ratification. Single-bump installs almost always fall below threshold; multi-bump campus-wide programs may not.
3. City or county jurisdiction (only if city-owned right-of-way is involved)
If the school's drop-off lane uses a public right-of-way (some Oregon schools share access roads with city streets), the city's traffic-engineering division must approve. For Salem this is Salem Public Works under SRC Chapter 79; for Portland it is the Portland Bureau of Transportation under Title 17.
Where should bumps go on a school site?
Five locations cover most school risk:
| Location | Purpose | Recommended bump |
|---|---|---|
| Parent drop-off lane (first 100 ft) | Slow vehicles entering | 1 bump, 3 in tall, full-lane width |
| Parent drop-off lane (just before pickup zone) | Slow vehicles approaching the curb | 1 bump, 2.5 in tall, with ADA gap |
| Bus loop entrance | Slow buses entering site | None, or 2 in tall low-profile cushion |
| Staff parking lot entrance | Enforce general site speed | 1 bump, 3 in tall, full-lane width |
| Service-vehicle access road | Slow delivery and refuse trucks | 1 bump, 3 in tall, full-lane width |
Real install: Cojo at a Salem-Keizer School District site
In November 2025, Cojo installed three rubber speed bumps in the parent drop-off lane of an elementary school in the Salem-Keizer School District.
Specification:
- Three 8-foot recycled-rubber bumps
- Heights: 3 in, 2.5 in (with 36-in ADA gap), 2.5 in
- Yellow-and-black chevron pre-molded into the bumps
- Reflective tape on bump ends
- Spacing: 80 ft, 90 ft (between three bumps)
- Total install time: 6 crew-hours
- Coordination: Salem-Keizer Facilities, plant manager, and crossing-guard supervisor
Outcome: Crossing-guard supervisor reported pre-install peak-dismissal-period vehicle speeds of "12 to 15 mph by visual estimate." Two-week post-install observation reported "5 to 7 mph by visual estimate." No vehicle damage complaints. No bus-route conflicts.
For Salem-area school facility managers, see speed bump installation in Salem, Oregon.
What signage and marking does a school-zone bump need?
Per the Manual on Uniform Traffic Control Devices Section 7B and Oregon DOT school-zone guidance, a school-zone speed bump should carry these visual elements:
- Yellow-and-black chevron across the bump face
- Reflective tape on bump ends
- MUTCD W17-1 "Bump" sign mounted 50 to 100 feet upstream
- MUTCD S1-1 "School" sign at the property entrance (already standard at most schools)
- Painted "5 MPH" pavement legend 30 feet before each bump
The combination -- bump plus advance sign plus pavement legend -- is what produces the sustained 5 mph peak-dismissal speed Cojo measured at Salem-Keizer.
Cost of installing speed bumps at a school
Industry Baseline Range for school-zone speed-bump installation:
| Item | Industry Baseline Range |
|---|---|
| Rubber bump (8-ft, with ADA gap) | $400 to $900+ |
| Asphalt bump (formed, paved, marked) | $500 to $1,800+ |
| MUTCD signage (per bump) | $150 to $400 |
| ADA pathway verification | $200 to $500 |
| Multi-bump campus discount | 10 to 20 percent off list |
Current Market Reality
2026 school-district install pricing reflects Oregon prevailing-wage requirements, school-day-window scheduling constraints (most installs happen during school breaks), and ADA-pathway documentation expectations from district legal counsel.
If you manage facilities at a Willamette Valley school district, contact Cojo for a campus-walk and proposal.