A new bridge route is safe only when the entire trip is safe: the approach, bridge deck, transitions, crossings and connections at both ends. Assess whether walking and cycling space stays continuous, whether its clear width suits the expected users, whether grades and speed differences create conflicts, whether barriers prevent falls, and whether the design meets the current accessibility and transportation standards adopted for the project.
A checklist can reveal risks, but it cannot certify a specific bridge without project plans, user forecasts, site conditions and the responsible jurisdiction’s current requirements. Use the process below to structure a documented review by the owner, qualified designers and an independent road-safety team.
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Define what “safe” must cover
Safety is not limited to the bridge deck. A separated path can become hazardous where it narrows at an abutment, changes sides, ends before a crossing, intersects a ramp or forces users into motor traffic. The assessment should follow the route continuously from the existing pedestrian and bicycle network on one side, across the structure, to the destinations on the other.
Assess both normal operation and foreseeable stress conditions: peak demand, two-way travel, people passing, a person using a wheelchair or other mobility device, a cyclist climbing slowly, a faster cyclist descending, darkness, rain, maintenance activity and an unexpected obstruction. Record what is known, what is assumed and what still requires field measurement or design verification.
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Do not issue a generic “safe” label
Federal Highway Administration (FHWA) guidance is intended to support context-sensitive planning and design. It does not replace the current standards adopted by the bridge owner, state or local transportation agency. A route-specific conclusion requires the applicable jurisdiction, design edition, geometry, expected demand and an evaluation by the responsible professionals.
Trace the complete route at both ends
Begin with a plan view and a site walk, if the alignment exists. Mark every point where a person walking or cycling must make a decision or interact with another mode.
Map the approach and departure
- Trace the route back to the nearest sidewalks, trails, bicycle facilities, transit stops, homes, schools, businesses and public destinations.
- Check whether people can reach the bridge from both travel directions without crossing an uncontrolled high-speed roadway or entering a driveway conflict.
- Locate curb ramps, detectable warnings, refuge areas, crossings, signal equipment and any points where the path changes side.
- Identify sight-line restrictions caused by retaining walls, bridge rails, landscaping, signs, parked vehicles or the structure itself.
- Verify that the facility does not simply stop at an abutment or discharge users into a shoulder, traffic lane or inaccessible surface.
The FHWA Bicycle Road Safety Audit Guidelines and Prompt Lists warn that bridges and other structures can constrict or terminate designated cycling space. A safe-looking deck therefore does not compensate for an unsafe transition.
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Measure the usable route—not just the nominal right-of-way—where the path enters and leaves the bridge. Look for abrupt changes in width, pavement level, cross slope, surface, lighting or operating rules. A railing post, sign, drainage structure or expansion joint can reduce the clear passage available to a wheelchair user or make a cyclist swerve.
If walking and cycling facilities are provided on only one side, document how users on the opposite side reach them and return safely. The FHWA audit prompts specifically ask whether there is a safe access and departure route when accommodation is one-sided.
Identify users, demand and operating conditions
Width and separation decisions depend on who will use the route, how many people will use it and how their speeds differ. Obtain counts or defensible forecasts for pedestrians and cyclists by direction and time of day. Include commuting, school travel, recreation, deliveries or service vehicles that the path is legally permitted to carry, and seasonal peaks.
Describe the user mix
- People walking alone, in pairs or in groups.
- People running, pushing strollers or accompanying children.
- Cyclists ranging from young or inexperienced riders to fast commuters and cargo-bike users.
- People using wheelchairs, mobility scooters or other assistive devices.
- Maintenance, emergency or authorized service users.
Do not treat a forecast average as the whole operating condition. A low daily average can still produce a dangerous short peak near a school, event venue, transit stop or recreational destination. Note the likely percentage of two-way travel and whether users can pass without entering a motor-vehicle area.
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Separate demand from design assumptions
Create a short assumptions register. For every volume, speed or user characteristic, state its source, forecast year, time period and uncertainty. If no reliable count exists, identify the missing information rather than silently treating the path as lightly used. The designer can then test whether added width, mode separation or operational controls are needed.
Evaluate clear width and mode separation
Measure the continuous, unobstructed width available to users. Deduct fixed objects, railings, signs, utility cabinets, drainage features and any shy distance that users will realistically maintain from a barrier or traffic stream. Compare that clear width with the expected two-way flow and passing demand.
Use historical figures carefully
FHWA’s archived Evaluation of Safety, Design, and Operation of Shared-Use Paths (July 2006) reports historical AASHTO guidance of 3 metres (10 feet) as the recommended paved width for a typical two-directional shared-use path. It also reports that 3.6 to 4.2 metres (12 to 14 feet) may be considered in some substantial mixed-use situations.
Those figures are not a universal current design rule. They are historical recommendations reproduced in an archived FHWA report. The project must use the current standard adopted by the relevant agency, along with its own demand, context and accessibility analysis.
| Historical figure reported by FHWA (2006) | What it describes | How to use it today |
|---|---|---|
| 3 m (10 ft) | Recommended paved width for a typical two-directional shared-use path | Use only as historical context; verify the current adopted criterion |
| 3.6–4.2 m (12–14 ft) | Widths that may be considered for some substantial mixed-use conditions | Test against current standards, forecast demand and local constraints |
Decide whether sharing is workable
A shared path may be appropriate where volumes and speed differences are modest and the clear width permits comfortable passing. Consider separate pedestrian and bicycle space when demand is high, users have materially different speeds, sight distance is limited, or the bridge geometry leaves no recovery area.
Separation must be continuous and legible. A line or symbol that disappears at a bridge joint, pinch point or intersection can create more conflict than it resolves. Check which side each mode uses, how users merge at both ends and whether a person can move around an obstruction without crossing into the faster stream.
Analyze grades, speed and passing conflicts
Survey the approach and deck gradients, not just the bridge’s nominal elevation change. A cyclist climbing may be moving slowly and using more lateral space, while a cyclist descending may be travelling considerably faster. On a constrained route, they may have no safe room to pass or avoid a pedestrian.
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Review each direction separately
- For uphill travel, determine whether a slow cyclist can be passed without entering a hazardous lane or crossing into opposing users.
- For downhill travel, check whether higher bicycle speeds bring riders close to pedestrians, railings, driveways or motor traffic.
- At the crest of a bridge, verify sight distance for both walking and cycling. A user should not emerge from a blind point directly into another stream.
- At the bottom of a grade, look for a crossing, merge or stop condition that gives a fast rider too little time to react.
The FHWA road-safety-audit checklist asks whether vehicles can pass slow cyclists uphill and whether high-speed cyclists on downhill segments are separated from traffic. Apply the same conflict logic to interactions among path users, even where motor traffic is not directly involved.
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A path that is comfortable on level ground can become difficult where a steep approach meets a narrow deck. Identify locations where riders must brake, accelerate, turn or merge. Consider whether a person walking, using a mobility device or pushing a stroller can maintain control and whether drainage, surface changes or weather could increase stopping distance.
Inspect separation from motor traffic and intersections
Record the distance and physical separation between the active route and moving vehicles. A painted line is not equivalent to a raised buffer, barrier or independent alignment; the appropriate treatment depends on the adopted roadway and bridge standards.
Study every crossing and conflict point
- List side-street, ramp, driveway, maintenance-access and emergency-access crossings.
- Check approach speed, sight distance, turning paths and the likelihood that a driver will block the facility while waiting.
- Determine whether a person walking or cycling can see and be seen by turning drivers.
- Verify that signs, signals, markings and priority rules are understandable from every approach.
- Assess whether the route encourages predictable movements rather than last-second weaving.
Where the bridge carries a road, inspect the full barrier and shoulder arrangement. Where it carries a trail or path, inspect how emergency and maintenance vehicles enter without creating a permanent obstruction.
Assess edge protection and fall risk
Bridge users need protection from falls into the roadway, water, railway or space below. Examine the railing, parapet, curb, transition between barrier types and the possibility of a wheel, handlebar or small child reaching an opening. Consider climbing opportunities, impact exposure and maintenance access.
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FHWA’s 2006 University Course on Bicycle and Pedestrian Transportation, Lesson 9, states a 1.1-metre (42-inch) barrier height in its bridge-sidewalk discussion. That lesson is dated guidance, not a current universal minimum. Verify the barrier height, opening limits, load requirements and accessibility provisions against the bridge and building standards currently adopted for the project.
Look beyond the nominal height
- Check whether the walking or cycling surface is raised, sloped or curved toward the edge.
- Inspect joints and drainage grates for wheel-trap or skid hazards.
- Confirm that the barrier remains continuous through expansion joints and at approach transitions.
- Review whether a crash or maintenance event could leave a gap before repairs are made.
- Assess lighting and contrast so the edge is visible at night and in bad weather.
Review surface, drainage, lighting and obstructions
Surface quality affects both crash risk and accessibility. Inspect smoothness, skid resistance, loose material, ponding, ice exposure, utility covers and expansion joints. Confirm that drainage does not discharge across the path or create a slippery strip near the railing.
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Check lighting for continuity from the existing network onto the bridge and through both approaches. A bright deck with dark transitions can conceal pedestrians, cyclists or obstacles. Document poles, signs, cabinets, vegetation and snow-storage locations that reduce the usable envelope or sight distance.
FHWA’s Guide for the Development of Bicycle Facilities, 4th Edition (2012) and its Guide for the Planning, Design, and Operation of Pedestrian Facilities (produced 2004; page updated 2014) address accessibility, width and clearance, surfaces, lighting, obstacles, shared-use paths and sidewalks on highway bridges. Use those guides as design references, then confirm the enforceable requirements in the current local and state standards.
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Verify accessibility as a continuous experience
Accessibility is not satisfied by a ramp at one end if a person using a wheelchair cannot cross the deck, negotiate a joint, pass another user or reach the destination at the other end. Review the complete accessible route in both directions.
Test the route for practical usability
- Confirm that curb ramps and transitions connect smoothly to the bridge path.
- Check running grade, cross slope, landing conditions and turning space against the current adopted accessibility criteria.
- Ensure that clear width remains available around railings, signs, utility equipment and maintenance features.
- Inspect detectable warnings, tactile information, handrails and edge protection where required.
- Consider how a mobility device user can stop, pass another person and recover from a minor steering error.
Record the applicable accessibility edition and authority. Exact dimensional requirements cannot be determined without the bridge location, owner, route geometry and adopted standards.
Apply the current jurisdictional standards
Identify the agencies with authority over the bridge, road, path, waterway, railway and accessible route. Obtain the adopted editions of bridge, roadway, pedestrian, bicycle, traffic-control and accessibility standards before judging compliance.
FHWA’s bridge-program FAQ points to 2023 planning, program and project-development guidance, while the principal facility sources reviewed here span 2004 to 2016. This mix illustrates why a historical FHWA figure should not be presented as a current universal requirement. Ask the owner or lead designer to identify which provisions are mandatory, which are advisory and which require a documented exception.
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Build a compliance register
| Item | Record |
|---|---|
| Authority and location | Bridge owner, road agency, path owner and jurisdiction |
| Applicable editions | Current bridge, roadway, accessibility and traffic-control standards |
| Design element | Width, grade, barrier, surface, lighting, crossing or transition being checked |
| Evidence | Plan sheet, survey, calculation, field observation or forecast |
| Status | Compliant, non-compliant, unresolved or requiring agency interpretation |
| Action | Design change, additional study, operational treatment or documented exception |
Conduct an independent road safety audit
Use a road safety audit or equivalent multidisciplinary review before construction and, where possible, during preliminary design. The FHWA Bicycle Road Safety Audit Guidelines and Prompt Lists are useful prompts; they are not a substitute for the project’s formal audit procedure.
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- Assemble the audit information. Provide plans, profiles, cross-sections, staging, forecasts, crash history where available, maintenance plans, lighting information and the applicable standards.
- Include the right disciplines. Involve pedestrian and bicycle specialists, bridge and roadway designers, accessibility expertise, traffic operations, maintenance and representatives familiar with local users.
- Review drawings and walk the site. Examine the route in both directions and, where safe and lawful, at representative peak periods, night conditions and weather conditions.
- Use structured prompts. Ask whether bridges and tunnels have adequate bicycle accommodations on both sides, whether two-way travel is handled, whether continuity is maintained, whether conflicts are predictable and whether gradient affects use.
- Describe each finding precisely. State the location, user affected, operating condition, conflict mechanism and likely consequence. Attach a plan reference or photograph where appropriate.
- Rate risk under the agency’s process. Use the owner’s definitions for severity and likelihood rather than inventing a numerical score that has no local meaning.
- Identify feasible treatments. Consider geometry changes first, then separation, crossings, signing, markings, lighting, barriers, maintenance or operational controls.
- Close the loop. The project owner should accept, modify or reject each recommendation in writing and document any unresolved risk or approved exception.
Compare alternative bridge alignments
When more than one route is proposed, compare the complete connections rather than selecting the alignment with the most attractive deck cross-section. Use the same demand assumptions and standards for every option.
| Comparison axis | Questions to answer |
|---|---|
| Continuity | Does the route connect safely to existing facilities and destinations at both ends, with no pinch points or forced crossings? |
| Motor-traffic separation | How close are users to moving vehicles, and what physical or operational separation exists? |
| Usable width | What clear width remains after barriers, signs, drainage and other obstructions, and can users pass at forecast demand? |
| User conflicts | Are walking and cycling shared, separated or merged, and are those decisions consistent through transitions? |
| Grade and speed | Where do slow climbs, fast descents, blind crests or braking zones create conflicts? |
| Edge protection | Does the barrier prevent falls and remain continuous through joints and approaches? |
| Visibility and surface | Are lighting, sight lines, drainage, skid resistance and maintenance adequate in expected conditions? |
| Accessibility | Can people using mobility devices complete the route in both directions without unreasonable detours or obstacles? |
| Standards and mitigation | Does the option meet current adopted criteria, and can identified deficiencies be corrected within the project constraints? |
A slightly longer alignment with continuous, separated connections may be safer than a short bridge whose approaches force complex crossings. Make that trade-off explicit in the decision record.
Recognize red flags before approval
- The path is shown on the deck but not on one or both approaches.
- Clear width is measured between nominal boundaries rather than around fixed obstructions.
- A shared path relies on a historical width figure without a current demand or standards check.
- A steep approach meets a narrow deck, blind crest or high-conflict crossing.
- Users must change sides without a clearly designed, accessible crossing.
- Railings or barriers stop at joints, abutments or temporary works.
- Lighting ends where the bridge begins or leaves a dark transition at either end.
- Drainage, expansion joints, grates or surface defects create wheel, skid or trip hazards.
- No one has tested the route for wheelchair users, children, slower cyclists or people travelling at night.
- The design team cannot identify the current adopted standards or the authority responsible for approving them.
Document the decision and its limits
A useful assessment leaves an auditable record. Include a route map, photographs or plan references, user and demand assumptions, measured clear widths, grades, sight lines, barrier details, surface and lighting observations, accessibility checks, applicable standards, audit findings and the owner’s responses.
Distinguish between a design deficiency, a missing piece of evidence and a risk that remains after feasible treatments. State who must resolve each item and before which project milestone. If a conclusion depends on a future count, survey, standard interpretation or maintenance commitment, make that dependency visible.
No named statistic about pedestrian or cyclist bridge-route safety outcomes is established by the FHWA materials summarized here. The width and barrier figures above are design guidance from dated sources, not measured safety-outcome statistics.
What a defensible conclusion looks like
A defensible conclusion does not say that a bridge is safe because it passes a generic checklist. It states that the complete route was examined, identifies the users and operating conditions considered, shows how width, separation, grade, speed, barriers, visibility, surfaces and accessibility were evaluated, and confirms which current jurisdictional standards govern the decision.
If important geometry, demand, standards or audit responses are missing, the appropriate conclusion is that safety has not yet been established. The next step is to obtain the missing evidence and have the responsible agency and qualified design professionals resolve the findings before opening the route.
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