School-zone speed humps target 20 mph (or 15 mph during posted school hours) on streets that approach elementary and middle schools. The right device is a 12-foot parabolic asphalt hump with bus-clearance verified and pavement marking that meets MUTCD standards. School-zone installations also require coordination with the school bus operator, the school district transportation office, and the Oregon Department of Transportation when the street is on a state-designated school route. Five products dominate this application.
Selection criteria
Three school-zone-specific factors push the device choice:
- Bus clearance. School buses have low ground clearance (roughly 8 to 10 inches at the rear axle). Humps must not damage bus undercarriages.
- Posted school-zone speed. 15 to 20 mph during school hours. Device profile calibrated for that range.
- Drop-off lane application. Some installs go on the school's own driveway/drop-off lane (private) versus the approach street (public).
1. Asphalt Watts profile, 12 ft (the default)
The 12-foot parabolic Watts profile slows cars to 18 to 20 mph at the apex with no bus-clearance issues at the standard 3 to 3.5 inch height. ITE Traffic Calming Manual Chapter 3 lists this as the recommended residential and school-zone hump profile.
Best for: Standard school approach streets at 25 mph posted (20 mph school hours).
2. Asphalt sinusoidal, 14 ft (cyclist-friendly)
For school streets that are also designated bike routes (Walk-and-Roll-to-School corridors are common in Eugene, Portland, and Beaverton), the sinusoidal profile delivers better cyclist comfort. The Federal Highway Administration's Traffic Calming ePrimer documents reduced cyclist discomfort with sinusoidal humps versus parabolic (FHWA ePrimer).
Best for: School streets on the city's neighborhood greenway or bike-to-school network.
3. Asphalt flat-top (speed table), 22 ft (bus-route compatibility)
When the school approach street is also a bus route, the 22-foot flat-top profile lets school buses and transit buses ride at 20 mph without passenger discomfort. Eugene 4J School District has used speed tables on several elementary-school approach streets for this reason.
Best for: School streets that double as transit bus routes; school streets where school buses make multiple daily passes.
4. Asphalt Seminole profile, 14 ft (gentler for older drivers)
The Seminole 14-foot profile reduces driver complaints by 30 to 40% compared to the 12-foot Watts profile while delivering similar slowing performance. Useful for school zones in retirement-community-adjacent neighborhoods or on streets with significant rideshare or grandparent drop-off traffic.
Best for: School zones in mixed-demographic neighborhoods where driver complaints have been a barrier to traffic-calming programs.
5. Modular rubber, 12 ft (private-school driveways)
Private-school driveways can use removable rubber humps to manage drop-off-line speeds without permanent infrastructure changes. The modular units bolt to existing pavement and can be removed for resurfacing or property repaving.
Best for: Private-school drop-off lanes, charter-school parking lots, daycare facility approach driveways.
How to pick between them
Three checks:
- Is the street a public road or private property? Public roads use options 1 to 4 (asphalt). Private school property uses option 5 (rubber) for flexibility, or asphalt for permanence.
- Does the street carry buses? If yes, option 3 (flat-top) is preferred to avoid bus suspension wear and passenger discomfort.
- Is cyclist traffic a priority? If yes, option 2 (sinusoidal). If no, option 1 (Watts) is the default.
In a 2025 install for the Salem-Keizer School District, our crew used option 1 (Watts profile) on three approach streets to a middle school. The streets carry buses but only twice per day; the Watts profile delivered the right slowing without the cost premium of speed tables.
What it costs
Industry Baseline Range
| Option | Installed Cost (per unit) |
|---|---|
| Asphalt Watts, 12 ft | $1,500 to $4,500 |
| Asphalt sinusoidal, 14 ft | $1,800 to $5,500 |
| Asphalt flat-top (speed table), 22 ft | $5,000 to $15,000 |
| Asphalt Seminole, 14 ft | $1,800 to $5,000 |
| Modular rubber, 12 ft | $2,000 to $4,500 |
Current market reality
School-zone installs typically receive cost reductions through district maintenance contracts (multi-school packages share mobilization and traffic control across sites). A 4-school district package can cut per-unit costs 20 to 30% versus single-site work. Public-school installs on Oregon DOT-designated school routes may be eligible for federal Safe Routes to School (SRTS) funding (Oregon DOT SRTS).
What about pavement marking and signs?
School-zone humps need:
- Yellow chevron pavement marking on the leading face per MUTCD.
- W17-1 advance warning sign at 100 to 200 feet upstream.
- School-zone advance warning (S1-1 with associated S4-3 plaque) per MUTCD where the hump is within the school-zone limits.
- Reflective markers embedded in the hump surface where required by city spec.
The W17-1 sign uses MUTCD black-on-yellow standards. Oregon DOT publishes school-zone signage standards in its Traffic Manual; coordinate with the school district transportation office and city public works before final placement.
Frequently asked questions
What is the right speed hump for an elementary school? 12-foot Watts profile asphalt hump for the standard application. Step up to a sinusoidal profile if the street is on a bike-to-school corridor; step up to a speed table if the street carries buses regularly.
Can speed humps be installed on a school's own property? Yes. Private-school property and school-district-owned drop-off lanes can install humps without city traffic-calming approval. Public-school property usually still coordinates with city public works for signage placement.
Do school speed humps need to be removable? On public streets, no. On private school driveways, removable rubber humps offer flexibility for resurfacing and reconfiguration.
Where can I see school-zone hump specs? ITE Traffic Calming Manual Chapter 3 covers the device specs. Oregon DOT's Traffic Manual covers school-zone signage and pavement marking. Local city traffic-calming programs publish project-specific specs.
Is there federal funding for school-zone speed humps? Yes. The federal Safe Routes to School (SRTS) program funds traffic-calming infrastructure near elementary and middle schools. Oregon DOT manages the state-level program; school districts apply through the state office.
Get School-Zone Specifications
Cojo installs school-zone speed humps across Oregon, with Safe Routes to School coordination and school-district contracting experience. Contact Cojo for a quote, or see our speed humps for school zones deep dive.