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The right neighborhood traffic-calming measure depends on where the problem occurs: a speed hump slows traffic along a street segment, a raised crosswalk targets speed at a pedestrian crossing, and a neighborhood traffic circle changes vehicle paths through an intersection. There is no universal winner. Match the design to measured speeds and crashes, crossing needs, emergency and transit access, drainage, accessibility, and local standards—not just to the feature that seems most visible.
The cost figures below are approximate FHWA implementation estimates, not current local bids. Effectiveness figures summarize field studies and are not promises about a particular street.
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At a glance
| Measure | Best for | Key spec | Approximate cost | Checked |
|---|---|---|---|---|
| Speed hump | Excessive speeds along a local residential street | Typical FHWA description: about 12 feet long and 3–4 inches high | $2,000–$4,000 per unit | November 2026 |
| Raised crosswalk | A warranted pedestrian crossing where vehicles should slow at the crossing | Marked crosswalk on a flat-topped speed table with approach ramps | $4,000–$8,000 | November 2026 |
| Neighborhood traffic circle | Speed or angle/turning conflicts at an unsignalized neighborhood intersection | Raised island around which vehicles circulate | $10,000–$25,000; typical unit cost around $15,000 | November 2026 |
Prices checked November 2026.
FHWA estimates include design, materials, and construction but exclude right-of-way costs. They are approximate, not local bids or lifecycle costs. Source: FHWA traffic-calming toolbox.
What problem does each measure solve?
Choose by the location of the conflict, not by treating the three designs as interchangeable. A hump acts along a roadway segment, a raised crosswalk focuses on a crossing, and a circle changes how drivers approach and pass through an intersection.
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- Speed hump: Consider it when the documented problem is excessive speed along a local residential street or neighborhood collector, including a segment near a school, park, or community center.
- Raised crosswalk: Consider it where a pedestrian crossing is warranted and drivers need to slow at that crossing. It combines a speed table with a marked crossing and raises the pedestrian area.
- Traffic circle: Consider it where speed, turning, or angle-conflict concerns occur at an unsignalized neighborhood intersection. The raised island makes drivers change their path through the junction.
A circle is not a stand-alone answer to midblock speeding. Likewise, one raised crosswalk may slow vehicles at the crossing without keeping them slow along the whole block. FHWA notes that the effect of a single raised crosswalk fades with distance; a series may be needed if the objective is slower speeds over a longer segment.
What is the difference between a speed bump and a speed hump?
FHWA uses the terms for different shapes and settings, although everyday speech often mixes them up. The distinction matters because a short, abrupt bump intended for a parking lot is not the same design as a roadway hump used for neighborhood traffic calming.
A typical FHWA speed hump is about 12 feet long and 3–4 inches high. It is a long raised roadway feature intended to encourage low speeds on public roads. A speed bump is much shorter—often 1–2 feet long—and can be up to 6 inches high; it is typically found in a parking lot or commercial driveway. See FHWA’s descriptions of humps and other vertical measures.
When discussing a public-street project, say “speed hump” if that is the measure under consideration. A hump still causes some discomfort and delay when vehicles cross it, so its profile, spacing, road function, drainage, and route users need engineering review. It is not simply a device a resident can select by height.
How effective are the measures?
FHWA’s field-study summaries show that all three approaches can affect speed or safety, but the results vary by site and study. Use the figures as evidence that a measure can work—not as a forecast for an individual neighborhood.
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| Measure and outcome | FHWA-reported findings | How to interpret it |
|---|---|---|
| Speed humps: crashes | 33%–48% crash reductions across five field studies of 51 speed humps | FHWA cites its July 2014 Engineering Speed Management Countermeasures reference; local results can differ. |
| Speed humps: speed | 6–13 mph reductions in 85th-percentile speeds across seven field studies of 199 humps | This is a summary of studied sites, not a guaranteed reduction for a proposed street. |
| Speed tables: crashes | 36%–64% crash reductions across three field studies of 27 speed tables | A raised crosswalk is a speed table designated and marked as a pedestrian crossing; the speed-table estimate should not be presented as applying identically to every raised crosswalk. |
| Speed tables: speed | 4–11 mph reductions in 85th-percentile speeds across six field studies of 98 speed tables | Use as context for the broader speed-table form, not a site-specific prediction. |
| One raised crosswalk | 85th-percentile speeds of 20–30 mph while crossing it | FHWA’s live ePrimer says the effect fades with distance from the crossing. |
| Traffic circles: speed | 5–13 mph lower speeds within a circle and 1–6 mph lower in its vicinity | FHWA says a circle generally reduces speed less than a small modern roundabout or mini-roundabout. |
| Traffic circles: traffic volume | Average 29% reduction across 51 circles; site results ranged from an 86% reduction to a 270% increase | The wide range reflects variation in local route choices; it is not a reliable forecast for a new circle. |
The crash and speed ranges for humps and speed tables are attributed by FHWA to a July 2014 reference. The raised-crosswalk crossing-speed and traffic-circle figures come from FHWA’s undated live ePrimer pages, accessed in November 2026. Study counts and measured effects matter: a result from several sites does not guarantee the same outcome on a street with different geometry, traffic, or driver behavior. The FHWA discussion of motor-vehicle speed and volume effects also makes clear that volume changes around circles vary substantially.
What are the trade-offs for emergency vehicles, buses and large vehicles?
Emergency response and transit can rule out or change an otherwise attractive design. FHWA screening guidance treats humps, speed tables, and raised crosswalks cautiously on emergency routes; humps and circles are likely inappropriate on thoroughfares or major streets. These are screening principles, not substitutes for local standards and project-specific review.
Humps and raised crosswalks: FHWA generally does not consider them appropriate on primary emergency routes or streets providing access to a hospital or emergency medical services. A properly designed hump can be crossed slowly, but it still imposes delay. Speed tables generally cause less delay and jarring than humps; speed cushions and offset speed tables were developed in part to address fire-vehicle mobility concerns. A local agency should assess the actual route and design rather than assume one treatment fits all emergency vehicles.
Traffic circles: A typical circle may not leave enough room for a left-turning truck, bus, or emergency vehicle to circulate around the island. Depending on the design and local rules, a large vehicle may make a permitted maneuver in front of the island; a mountable apron can reduce the vehicle’s deflection. FHWA cites early Portland and Montgomery County studies in which fire-vehicle delay associated with circles ranged from about one second to more than ten seconds. Those older, site-specific findings should not be treated as a current universal estimate.
Bus routes: FHWA says raised crosswalks can be suitable on a bus route when bus operating speeds are around 25 mph. It advises against placing one near a bus stop where passengers may be moving between standing and sitting as the bus crosses the raised feature. Stop location and vehicle operation should be reviewed together.
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What design details can make a project unsuitable?
Geometry, drainage, accessibility, utilities, and street function affect feasibility as much as the broad category of treatment. Raise these issues with the local transportation agency before a preferred design is treated as settled.
- Street function and route screening: FHWA says speed humps and traffic circles are likely inappropriate on thoroughfares or major streets. Emergency-route concerns apply to vertical measures, including raised crossings. Ask the agency to confirm the road classification, route function, and applicable local criteria.
- Drainage: A curb-to-curb raised crosswalk can change surface drainage. FHWA calls for evaluation of drainage and hydraulic effects; a catch basin may be needed upstream. Depending on the site, possible approaches include an upstream inlet or a trench drain designed for pedestrian use.
- Accessible crossing edges: If the raised crossing meets sidewalk curb height, its edge should remain detectable to people with visual impairments. FHWA gives detectable warnings or truncated domes and appropriate contrast as examples. Accessibility review should be part of design, not an afterthought.
- Intersection geometry: A traffic circle needs to accommodate the paths of ordinary vehicles and the larger vehicles that may use the intersection. Check turning movements, island form, and whether any mountable apron or permitted maneuver is appropriate.
- Driveways, utilities, and landscaping: Humps need review for spacing, drainage, and driveway access. For all projects, utility access points, landscaping, and project scale can change cost and layout.
- Signs and pavement markings: Warning users about a physical feature is a separate issue from designing the feature itself. FHWA’s MUTCD FAQ explains that “Speed bumps and humps are considered ‘physical features’ of a roadway rather than traffic control devices (TCDs), so the MUTCD does not address the height, width, length, or spacing of the actual humps and bumps.” The FAQ says signs and pavement markings warning road users about a feature are covered by the MUTCD. State and local design criteria still apply.
That MUTCD distinction is not permission to install an arbitrary hump. It explains why the MUTCD does not set the feature’s dimensions; the responsible agency’s engineering criteria and other applicable requirements remain essential. Read the FHWA MUTCD FAQ alongside the local rules.
How much do these measures cost?
FHWA’s approximate implementation estimates put speed humps at $2,000–$4,000 per unit, raised crosswalks at $4,000–$8,000, and traffic circles commonly at $10,000–$25,000, with a typical circle unit cost around $15,000. The circle estimate draws on Seattle experience. These figures include design, materials, and construction but exclude right-of-way costs; they are not current local bids or complete lifecycle costs.
Project scale, landscaping, drainage improvements, and relocating or redesigning utility access points can change the bill. A raised crossing that requires drainage work, for example, cannot be costed accurately from the basic feature estimate alone. A municipality’s standards, site investigation, and current estimate are needed for a real proposal. FHWA’s toolbox cost discussion gives the approximate ranges and their context.
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Start with a documented problem and let the location and evidence narrow the options. FHWA’s planning guidance recommends measuring the issue, examining whether arterial operations contribute to cut-through traffic, and involving residents in a plan that reflects the needs of local street users.
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- Describe the problem precisely. Is the concern speeding along a block, drivers failing to yield or turning quickly at an intersection, a risky pedestrian crossing, or some combination? Identify where and when it occurs.
- Measure before choosing hardware. Speed and traffic volume are likely primary evaluation measures, with other indicators selected to match the documented issue. Crash history, crossing conditions, or other locally relevant observations may matter to the agency’s review.
- Check the network context. Determine whether the street serves as a bus or emergency route, provides access to medical services, or functions as a major street. Consider whether arterial operations are sending cut-through traffic into the neighborhood.
- Match the treatment to the location. A segment-speed problem points toward a hump or another appropriate segment treatment; a crossing need points toward evaluating a raised crosswalk; an intersection speed or angle-conflict concern points toward evaluating a circle. Do not expect one circle to correct speeding halfway down a block.
- Ask for engineering and access review. Include emergency responders, transit operators, accessibility reviewers, and drainage staff as relevant. Check turning paths, driveway access, utilities, signs, markings, and local standards.
- Plan to evaluate and adjust. Compare speeds and volumes before and after installation, and track other measures tied to the original problem. FHWA says evaluation can lead to refining, relocating, or removing a measure; installation is not the end of the decision process.
For a specific street, the responsible local transportation agency is the place to confirm eligibility, design requirements, public process, and current cost. FHWA’s traffic-calming planning guidance emphasizes problem identification, community involvement, and evaluation rather than a one-size-fits-all device choice.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do the three options compare in practical terms?
The central trade-off is reach versus purpose: a hump influences a section of roadway, a raised crosswalk concentrates its effect where people cross, and a circle affects movement through a junction. Their costs and operational impacts rise or fall with site conditions, so choose based on the outcome the neighborhood needs and the constraints it can accommodate.
| Decision question | Speed hump | Raised crosswalk | Traffic circle |
|---|---|---|---|
| Where is the conflict? | Along a local street segment | At a pedestrian crossing | At an unsignalized intersection |
| What is the main purpose? | Encourage low speeds along the segment | Slow vehicles at a crossing and raise the pedestrian area | Change vehicle path and reduce approach/crossing speeds |
| What does it not solve by itself? | It may be inappropriate on major or primary emergency routes | One feature may not maintain lower speeds farther along a street | It does not address a midblock speeding problem on its own |
| What needs early review? | Route function, emergency and bus access, spacing, drainage, driveways | Crossing need, drainage, detectable edges, bus stop location, emergency access | Large-vehicle turning space, emergency access, intersection geometry |
FHWA treats neighborhood traffic circles, small modern roundabouts, mini-roundabouts, and larger roundabouts as distinct designs. A neighborhood circle should not be casually renamed a roundabout: their geometry and expected speed effects differ. If the intersection needs a different level of speed control or capacity, the agency can assess the appropriate intersection design rather than assuming a neighborhood circle is equivalent.
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A focused request gives engineers something actionable to evaluate and avoids locking the discussion into a treatment before the problem is understood. Bring the observed location and time pattern, any available speed or volume information, pedestrian crossing concerns, and details about bus, emergency, driveway, drainage, or accessibility needs.
Ask the agency which standards apply, whether the street is eligible for a vertical measure or circle, what additional data it needs, and how it will judge success. If the initial option conflicts with emergency access, drainage, or turning movements, ask whether another design is appropriate rather than insisting on a single device. For complex projects, qualified local traffic-engineering or road-safety planning professionals may be relevant, but the responsible public agency determines what is approvable on its roads.
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These are public-road infrastructure choices, not do-it-yourself street improvements. The design, approvals, warning signs, markings, and construction need to be handled through the relevant jurisdiction and its engineering process.
Frequently Asked Questions
Why doesn’t the MUTCD set the height and spacing of speed humps?
FHWA classifies humps and bumps as physical roadway features rather than traffic-control devices, so the MUTCD does not specify their dimensions or spacing. The agency responsible for the road still needs to apply its state and local engineering criteria; MUTCD requirements for warning signs and markings are a separate matter.
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A public-road hump is an infrastructure project, not a do-it-yourself installation. Residents should take the concern to the responsible transportation agency, which can determine eligibility, design, approvals, signs, and construction requirements.
Does a traffic circle reduce traffic volume on every street?
No. FHWA reports an average volume reduction of 29% across 51 circles, but individual site results ranged from a large reduction to a substantial increase. That spread means route-choice changes are highly location-dependent and the average should not be used as a prediction for one neighborhood.
Is a neighborhood traffic circle the same as a roundabout?
No. FHWA distinguishes neighborhood traffic circles from small modern roundabouts, mini-roundabouts, and larger roundabouts. The designs can produce different speed effects, so the term should not be used as if the treatments were interchangeable.
