Installing an asphalt speed hump correctly takes a 3-person crew, a paving roller, screed equipment, and traffic-control infrastructure per MUTCD Part 6. A single-unit install runs 4 to 6 hours and breaks into 8 numbered steps from layout to signage. Below: the standard 12-foot Watts profile on private property in Oregon's I-5 corridor. City-contracted work adds prevailing-wage labor and tighter signage standards. For full code citations, see speed hump standards.
Compliance disclaimer
This guide reflects 2026 specifications from the Institute of Transportation Engineers Traffic Calming Manual Chapter 3 and the Federal Highway Administration Traffic Calming ePrimer. Always verify current requirements with your local jurisdiction. Local fire codes (NFPA 1141, IFC 503) may impose additional constraints on streets identified as fire-priority access.
Tools and equipment list
- Chalk line and 25-foot tape measure
- Asphalt mill (1-inch depth capability) or saw cutter
- 6 to 8 cubic yards of hot-mix asphalt (delivered, 2 to 3 truck loads for one hump)
- 1-ton vibratory roller
- Hand screed (10-foot magnesium straightedge minimum)
- Tack coat sprayer
- Yellow traffic paint (8 to 10 gallons for chevron pattern)
- W17-1 advance warning sign with post and concrete base
- Traffic-control kit: 12+ cones, 4+ advance warning signs, flagger paddles
- Crew personal protective equipment
Time estimate
4 to 6 hours total: 60 to 90 minutes setup, 30 to 60 minutes mill, 90 to 120 minutes pour and screed, 60 to 90 minutes cure, 60 to 90 minutes paint and signage, 30 minutes teardown.
Step 1: Establish traffic control per MUTCD Part 6
Set up the work zone before any pavement work begins. The Manual on Uniform Traffic Control Devices (MUTCD) Part 6 governs work-zone setup (MUTCD Part 6). Place advance warning signs (W20-1 "ROAD WORK AHEAD") 500 ft upstream, lane-shift signs (W4-1) at 250 ft, taper cones at 100 ft, and a flagger station at the work zone perimeter.
Step 2: Lay out the hump centerline with chalk
Use a 25-foot tape measure to mark the hump centerline across the full lane width. The 12-foot Watts profile extends 6 feet upstream and 6 feet downstream of the centerline. Mark the leading edge (where the hump rises out of the existing pavement) and the trailing edge (where it returns to grade) with chalk.
Step 3: Mill the leading and trailing edges 1 inch deep
Use an asphalt mill or saw cutter to remove 1 inch of existing pavement on the leading and trailing 1-foot tapers of the hump footprint. The milled edges create a smooth transition from existing pavement to the new hump material. Skip this step on freshly paved overlays where the existing surface is structurally sound and the tack coat will bond cleanly.
Step 4: Apply tack coat to the milled surface
Spray a thin layer of asphalt emulsion tack coat over the milled area and a 6-inch buffer of existing pavement around the hump footprint. The tack coat ensures bond between the existing surface and the new hump material. Allow 15 to 30 minutes for the tack coat to break (turn from brown to black) before placing hot-mix.
Step 5: Place hot-mix asphalt in 1.5-inch lifts
Place hot-mix asphalt in 1.5-inch loose lifts across the hump footprint. Build up to the target profile in 2 to 3 lifts. The lift method creates uniform compaction and prevents the surface lift from sliding under roller pressure. Hot-mix should be placed at 280 to 320 degrees F for proper compaction; cooler material does not consolidate properly.
Step 6: Screed the parabolic profile by hand
Use a 10-foot magnesium straightedge to screed the Watts parabolic profile by hand. The profile rises from grade at the leading edge to 3.5 inches at the centerline, then descends to grade at the trailing edge in a smooth parabolic curve. Reference the Institute of Transportation Engineers (ITE) Traffic Calming Manual Chapter 3 cross-section diagram for exact ordinate values at 1-foot intervals.
Step 7: Compact with a 1-ton vibratory roller
Pass the roller across the hump 4 to 6 times in alternating directions. Start with edge passes (along the leading and trailing edges) to lock the perimeter, then center passes to consolidate the apex. Avoid rolling across the centerline at high speed; aggressive compaction can flatten the parabolic profile.
Step 8: Apply pavement marking and install signage
After the asphalt has cooled to ambient temperature (typically 60 to 90 minutes), apply yellow traffic paint in a chevron pattern on the leading face of the hump. The MUTCD-recommended chevron pattern uses 6-inch yellow stripes at 45-degree angles. Install the W17-1 advance warning sign 100 to 200 ft upstream of the hump on a metal post in a concrete base.
Step 9 (optional): Embedded reflective markers
Some jurisdictions require embedded reflective road studs (cat's-eye reflectors) on the apex of the hump for nighttime visibility. Drill the markers into the cured asphalt with epoxy adhesive. This step is optional for private-property installs but mandatory in some city standards.
Cost summary
Industry Baseline Range
| Item | Single Unit |
|---|---|
| Hot-mix asphalt material | $400 to $1,200 |
| Labor (crew + traffic control + roller) | $900 to $3,200 |
| Pavement marking + signage | $200 to $600 |
| Total installed cost | $1,500 to $5,000 |
Current market reality
Hot-mix asphalt prices in 2026 sit roughly 18% above 2024 baselines. Traffic-control labor remains tight. Most single-unit installs in 2026 land at the median-to-upper end of the range. For more cost detail, see the speed hump cost guide.
Safety considerations
Asphalt placement requires several safety controls:
- Hot-mix at 280 to 320 deg F can cause severe burns. Crew wears long sleeves, gloves, and steel-toe boots.
- The vibratory roller can cause crush injuries. Keep clear of the roller drum during operation.
- Traffic control protects crew from passing vehicles. Never work outside the cone-protected zone.
- The OSHA Standard for Construction (29 CFR 1926) governs construction-site safety practices (OSHA Construction).
Frequently asked questions
How long does it take to install a speed hump? A single-unit asphalt speed hump install runs 4 to 6 hours from setup to teardown with a 3-person crew.
Can I install a speed hump myself? Asphalt humps require professional paving equipment (mill, screed, roller) and are not realistic DIY projects. Modular rubber humps can be self-installed; see how to install rubber speed humps for the procedure.
Does the install need a permit? On public streets, yes; the city traffic-calming program issues the permit. On private property, a permit is rarely required but check with the local jurisdiction.
What is the right asphalt mix for a speed hump? A standard hot-mix dense-graded asphalt with PG 64-22 binder is the Oregon I-5 corridor default. High-elevation sites (Bend, Sisters) may need PG 70-22 or PG 76-22 for cold-weather flexibility.
How long does the install need to cure before traffic returns? Asphalt cures (cools below 100 deg F) within 60 to 90 minutes. Pavement marking adds 30 to 60 minutes for paint cure. Total return-to-traffic time is typically 90 to 150 minutes after the last lift is rolled.
Get a Professional Install
Cojo installs asphalt speed humps across Oregon with full ITE-compliant procedure, MUTCD-compliant signage, and OSHA-compliant safety protocols. Contact Cojo for a quote, or see our asphalt paving services.