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The length of the speed bump measured across the road width.
This typically spans the full width of the travel lane(s) the bump covers.
The width of the speed bump in the direction of vehicle travel.
This is the footprint dimension a vehicle's tire crosses as it drives over the bump.
The maximum height of the speed bump at its crown.
The crown height, and it is meaningless without the length along the road — the two together decide how a vehicle actually experiences it. Height is the figure that gets copied from another site while the length is left behind, and the result is a profile nobody intended: the same crown over a short base grounds a low car and jolts a bus, while over a long base it barely slows either.
A factor that scales down the full rectangular block volume to approximate the actual rounded cross-section.
A rounded or parabolic speed bump profile contains less material than a rectangular block of the same length, width, and height — the shape factor accounts for this difference.
Speed bump material needed
0.0729 yd³
The shape factor approximates a rounded or parabolic hump cross-section — actual material needed varies with the specific speed bump profile (circular, parabolic, or sinusoidal) specified by your project.
They open the calculator with your figures already in it
Speed Bump/Hump Material Volume Calculator: 0.0729 yd³ — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
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How this was calculated
Formula source(s)
- Material volume = length × width × height × a cross-section shape factor (commonly ~0.67 to approximate a rounded/parabolic hump profile rather than a full rectangular block)
Inputs used
- Speed Bump Length (Across the Road)
- 12 ft
- Speed Bump Width (Direction of Travel)
- 11.75 in
- Speed Bump Height
- 0.25 ft
- Cross-Section Shape Factor (~0.67 for Rounded Profile)
- 0.67
Confidence note: The shape factor approximates a rounded or parabolic hump cross-section — actual material needed varies with the specific speed bump profile (circular, parabolic, or sinusoidal) specified by your project.
What this calculation does not cover
- Describes the finished shape, not the mix that goes down. Hot asphalt is placed loose and compacts roughly a fifth thinner, so the quantity laid exceeds the in-place volume shown — build to the calculated figure and the bump finishes low, and a low bump slows nobody down.
- Asphalt is bought by mass, and this is a very small volume. At around 2.3 t/m³ (145 lb/ft³) compacted, a typical bump is a couple of hundred kilos of mix, well under any plant's minimum load — what actually gets paid for is the minimum ticket and the truck, not the volume, which is why bumps are worth batching with other paving on the same day.
- For a rubber bump, volume is the wrong unit altogether. Modular rubber comes as sections of fixed length with end caps, so the order is a section count across the road width plus the anchor bolts into the pavement — a cubic-metre figure converts to none of it.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.
Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.0.1
Regulatory standards & verification citations1
- Material volume = length × width × height × a cross-section shape factor (commonly ~0.67 to approximate a rounded/parabolic hump profile rather than a full rectangular block)
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