U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
|This report is an archived publication and may contain dated technical, contact, and link information
Publication Number: FHWA-HRT-05-112
Date: July 2006
Lesson 14: Shared Roadways
|(This picture shows bicyclists not wearing helmets. FHWA strongly recommends that all bicyclists wear helmets.)|
- Shared roadways:
|– Pavement markings.|
|– Wide curb lanes.|
|– Paved shoulders.|
|– Signed routes.|
|– Bicycle boulevards.|
- Design considerations:
|– Rumble strips.|
|– Drainage grates.|
|– Railroad crossings.|
|– Sidewalk bikeways.|
|– Raised curb dividers.|
* No pavment marking are required for shared roadways
Wide Curb Lanes
- Provide where inadequate width exists for bike lane or shoulder.
- 4.2–4.5 meters (m) (14–15 feet (ft)).
- Not greater than 4.5 m (15 ft)—cars use as two lanes.
Shared Lane Pavement Markings
- Indicate possible presence of bicyclists to motorists.
- Improve bicyclist positioning near parked vehicles and other obstacles.
Shoulders and Shoulder Bikeways
Designated Bike Routes
- Direct, continuous route.
- Cross-traffic stops.
- Vehicle traffic diverted.
- Traffic calming used.
- Ample signing.
- Bicyclists protected at crossings.
|(This picture shows a bicyclist not wearing a helmet. FHWA strongly recommends that all bicyclists wear helmets|
- Provided to alert motorists, but hazardous to bicyclists.
- Min. 4 ft of usable shoulder width required.
- Periodic gaps may be provided.
Treatments to Avoid
- Sidewalk bikeways:
|– Conflict at driveways/intersections.|
|– Conflict with pedestrians.|
|– Lead to confusion about right-of-way.|
- Raised concrete curbs (or other barriers) separating motor vehicles from bicycles.
- There are many ways to allow motor vehicles and bicycles to share the same roadway.
- Use of specific design elements creates a shared roadway that is bicycle–friendly.
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United States Department of Transportation - Federal Highway Administration