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Speed Hump & Speed Table | Raised Intersection & Raised Pedestrian Crossing

Raised Devices
Raised Intersection & Raised Pedestrian Crossing

A raised intersection is essentially a speed table (see photo below) for an entire intersection. Construction involves providing ramps on each intersection approach and elevating the entire intersection to the level of the sidewalk. They can be built with a variety of materials, including asphalt, concrete, or pavers. The crosswalks on each approach are also elevated as a part of the treatment, to enable pedestrians to cross the road at the same level as the sidewalk. This is good for mobility impaired pedestrians but may cause problems for the sight impaired if they cannot detect the curb edge.

A raised pedestrian crossing is also essentially a speed table, with a flat portion the width of a crosswalk, usually 10Ė15 feet. Raised intersections and crosswalks encourage motorists to yield. On one street in Cambridge, Massachusetts, motorists yielding to pedestrians crossing at the raised devices went from approximately 10 percent before installation of the project to 55 percent after installation.



A raised intersection slows all vehicular movements through the intersection and improves pedestrian crossings in all directions.



A raised pedestrian crossing provides a continuous route for the pedestrian at the same level as the sidewalk. Pavement markings on the slope (inlay type) make the crossing visible to motorists.



The material provided on this page is from the FHWA publication "Pedestrian Facilities User Guide." This guide is currently under review by practicioners and others in the field. Subsequently, the material provided on this page is subject to change in the future.


Roadway Narrowing

Lateral / Horizontal Shifts

Raised Devices

Complementary Tools

Whole Street Designs


Purpose:

• Tend to be the most predictable in reducing vehicle speeds.

• Enhances the pedestrian environment and pedestrian crossings.


Considerations:

• Donít use if sight distance is limited and/or the street is steep.

• If the street is a bus or emergency route, design must be coordinated. One device may be appropriate and may serve the primary need. Several raised devices may be disruptive, so other measures should be considered.

• Speed tables and raised crosswalks and intersections can be an urban design element through the use of special paving materials.

• Add tactile warning strips at edges to enable site impaired people to detect the crossing.

• Care must be taken in adding drainage.


Estimated Cost:

Raised crosswalks are approximately $5,000 - $7,000, depending on drainage conditions and materials used. The cost of a raised intersection is highly dependent on the size of the roads. They can cost from $25,000 to $70,000.







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