Print

by Lee R. Kenderdine, Metropolitan Government of Nashville and Davidson County, Tennessee; Janet Barlow, Accessible Design for the Blind; Laurie Kozisek, PE, City of Anchorage and Alaska Department of Transportation; and Chuck Yancey, Metropolitan Government of Nashville and Davidson County, Tennessee

Introduction

When engineers and architects work on a project that includes alterations within the rights-of-way, the construction of the curb ramps will require thought and planning. There is no standard layout for a curb ramp—each and every curb ramp is unique. The curb ramp must be designed to meet the existing topographical and physical constraints, and the requirements for curb ramp slope, cross slope, landings, and connection to the street.

Several factors need to be achieved to construct a curb ramp that will be usable by ALL pedestrians. For perpendicular curb ramps, the ramp slope must be perpendicular to the grade break at the gutter line. The curb ramp landing and gutter connection need to be designed and constructed so water does not pond at the base of the ramp or on the landing and debris does not accumulate. Debris and water reduce the usability of a curb ramp. The ramp and the landing need to be wide enough to be used by all users of the sidewalk system. If at all possible, the curb ramp slope needs to be aligned with the sidewalk and crosswalk to provide an additional cue to assist the visually impaired and blind persons in aligning to cross the street. Paired curb ramps on a corner allow better alignment for people using mobility aids and for pedestrians with vision impairments and make it easier to separate the APS.

This chapter provides examples of curb ramp designs that may be useful on 10 foot radius curb returns and 30 foot curb returns. In addition to topographical issues, width of the sidewalk and the distance between the sidewalk and curb can affect curb ramp design. Variations of these factors are also shown in the examples.

10-foot Radius Curb Returns

Example 1—Parallel Curb Ramp

CAD drawing of paired parallel curb ramps in 10-foot radius corner; APS locations indicated

Parallel Curb Ramp—5-foot sidewalk on tangents

Example 2—Parallel Curb Ramp, Large Shared Landing

CAD drawing of single parallel curb ramp in 10-foot radius corner; APS locations indicated

Blended Transition Curb Ramp—5-foot sidewalk on fan

Example 3—Perpendicular Curb Ramp

CAD drawing of paired perpendicular curb ramps in narrow sidewalk at 10-foot radius corner; APS locations indicated

Perpendicular Curb Ramp—5-foot sidewalk on tangents

Example 4—Perpendicular Curb Ramp

CAD drawing of paired perpendicular curb ramps in wide sidewalk at 10-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—12-foot sidewalk on tangents

Example 5—Combination Parallel and Perpendicular Curb Ramps

CAD drawing of paired combination curb ramps in sidewalk with parkway at 10-foot radius corner; APS locations indicated.

Combination Curb Ramp—6-foot parkway with 6-foot sidewalk on curve

Example 6—Perpendicular Curb Ramps

CAD drawing of paired perpendicular curb ramps in sidewalk with parkway at 10-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—6-foot parkway with 6-foot sidewalk on curve

Example 7—Combination Parallel and Perpendicular Curb Ramps
(slope in sidewalk approach and curb ramp perpendicular to the street)

CAD drawing of paired combination curb ramps in sidewalk with parkway at 10-foot radius corner; APS locations indicated.

Combination Curb Ramp—8-foot parkway with 5-foot sidewalk on curve

Example 8—Perpendicular Curb Ramps

CAD drawing of paired perpendicular curb ramps in sidewalk with parkway at 10-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—8-foot parkway with 5-foot sidewalk on curve

30-foot Radius Curb Returns

Example 9—Parallel Curb Ramps

CAD drawing of paired parallel curb ramps at tangent in narrow sidewalk at 30-foot radius corner; APS locations indicated.

Parallel Curb Ramp—5-foot sidewalk on tangents

Example 10—Parallel Curb Ramps

CAD drawing of paired parallel curb ramps on radius in narrow sidewalk at 30-foot radius corner.

Parallel Curb Ramp—5-foot sidewalk on curve

Example 11—Parallel Curb Ramps, Shared Landing

CAD drawing of single parallel curb ramp in sidewalk at 30-foot radius corner; APS locations indicated.

Parallel Curb Ramp, One Direction—5-foot sidewalk

(single shared curb ramp is less desirable than paired ramp)

Example 12—Parallel Ramps, One Shared Landing

CAD drawing of single parallel curb ramp in narrow sidewalk at 30-foot radius corner with full corner landing; APS locations indicated.

Perpendicular Curb Ramp—8-foot parkway with 5-foot sidewalk on curve

Example 13—Perpendicular Curb Ramps

CAD drawing of paired perpendicular curb ramps at tangent points in wide sidewalk at 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—12-foot sidewalk on tangents

Example 14—Perpendicular Curb Ramps

CAD drawing of paired perpendicular curb ramps on radius in wide sidewalk at 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—12- foot sidewalk on curve

Example 15—Perpendicular Curb Ramps

CAD drawing of single perpendicular curb ramp with wide shared landing in 12-foot sidewalk at 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—12-foot sidewalk on fan)

Example 16—One Perpendicular Curb Ramp

CAD drawing of single perpendicular curb ramp with narrow shared landing in 12-foot sidewalk at 30-foot radius corner; APS locations indicated

Perpendicular Curb Ramp, One Direction—12-foot sidewalk
(single shared curb ramp is less desirable than paired ramp)

Example 17—One Perpendicular Curb Ramp

CAD drawing of single perpendicular curb ramp in 12-foot sidewalk at 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp, One Direction—12-foot sidewalk
(single shared curb ramp is less desirable than paired ramp)

Example 18—Perpendicular Curb Ramp

CAD drawing of paired perpendicular curb ramps in sidewalk with parkway on 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—6-foot parkway with 6-foot sidewalk on tangents

Example 19—Perpendicular Curb Ramp

CAD drawing of paired perpendicular curb ramps on radius in sidewalk with continuous parkway on 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—6-foot parkway with 6-foot sidewalk on curve

Example 20—Combination Parallel and Perpendicular Curb Ramps

CAD drawing of paired perpendicular curb ramps at tangent in sidewalk with continuous parkway on 30-foot radius corner; APS locations indicated.

Combination Curb Ramp—6-foot parkway with 6-foot sidewalk on tangents

Example 21—Combination Parallel and Perpendicular Curb Ramps

CAD drawing of paired combination curb ramps on radius on sidewalk with continuous parkway on 30-foot radius corner; APS locations indicated.

Combination Curb Ramp—6-foot parkway with 6-foot sidewalk on curve

Example 22—One Perpendicular Curb Ramp

CAD drawing of single perpendicular curb ramp on radius on sidewalk with continuous parkway on 30-foot radius corner; APS locations indicated.

Parallel Curb Ramp, One Direction—6-foot parkway with 6-foot sidewalk
(single shared curb ramp is less desirable than paired ramps)

Example 23—Perpendicular Curb Ramps

CAD drawing of paired perpendicular curb ramps at tangent on sidewalk with continuous parkway on 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—8-foot parkway with 5-foot sidewalk on tangents

Example 24—Perpendicular Curb Ramps

CAD drawing of paired perpendicular curb ramps on radius on sidewalk with continuous parkway on 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp—8-foot parkway with 5-foot sidewalk on curve

Example 25—One Perpendicular Curb Ramp

CAD drawing of single perpendicular curb ramp on radius on sidewalk with continuous parkway on 30-foot radius corner; APS locations indicated.

Perpendicular Curb Ramp, One Direction–8-foot parkway with 5-foot sidewalk (single shared curb ramp is less desirable than paired ramps)

Case Study—Linking to Shop Entrances Case Study: Photo shows sloping street with brick sidewalks serving shop entrances.  Level runouts on the high side of the approach are used to provide accessible routes to the entrance doors, while steps connect entrance platforms from the low side.