Extensions | Choker
Crossing islands–also known as center islands, refuge islands, pedestrian islands or median slow points–are raised islands placed in the center of the street at intersections or midblock to help protect crossing from motor vehicles. Center crossing islands allow pedestrians to deal with only one direction of traffic at a time, and enable them to stop part–way across the street and wait for an adequate gap in traffic before crossing the second half of the street. Where midblock or intersection crosswalks are installed at uncontrolled locations (i.e.,where no traffic signals or stop signs exist), crossing islands should be considered as a supplement to the crosswalk. They are also appropriate at signalized crossings. If there is enough width, center crossing islands and curb extensions can be used together to create a highly improved pedestrian crossing.
This kind of facility has been demonstrated to decrease the percentage of pedestrian crashes and casualties by 57–82 percent.10 The factors contributing to pedestrian safety include reduced conflicts, reduced vehicle speeds approaching the island (if designed as such the approach can be designed to force a greater or lesser slowing of cars, depending on how dramatic the curvature is), greater attention called to the existence of a pedestrian crossing, opportunities for additional signage in the middle of the road, and reduced exposure time for the pedestrians.
Curb extensions may be built in conjunction with center crossing islands where there is on–street parking, Care should be taken to maintain bicycle access. Bicycle lanes (or shoulders, or whatever space is being used for bicycle travel) must not be eliminated or squeezed in order to create the curb extensions or islands.
Crossing islands allow pedestrians to be
concerned with one direction of traffic at a time. The roadway markings
and the deviation of the travel lane in the design shown here help
make motorists aware that a pedestrian may be crossing.
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.
Enhances pedestrian crossings, particularly at unsignalized
Reduces vehicle speeds approaching pedestrian crossings.
Highlights pedestrian crossings.
Do not squeeze bicycle access.
Illuminate or highlight islands with signs and reflectors to
ensure that motorists see them.
Design islands to accommodate pedestrians in wheelchairs. A
cut-through design such as depicted in the diagram works best.
Crossing islands at intersections or near driveways may affect
left turn access.
Costs range from $6,000 - $9,000. The cost for installing a raised
concrete pedestrian refuge island (with landscaping) is about $10,000
to $30,000. The cost is less for an asphalt island or one without