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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 10–15 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.
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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.
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Purpose:
• Tend to be the most predictable in reducing vehicle speeds.
• Enhances the pedestrian environment and pedestrian crossings.
Considerations:
• Don’t 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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