Design Considerations

1
Design Considerations
2
Level Landings

• Problem
• Perpendicular curb ramps without level landings
  are poor design because they cause severe cross
  slopes and rapid changes in cross slope over
  short distances.

3
Diagonal Ramps are NOT ideal

• At diagonal curb ramps, wheelchair users cross in
  different location than other pedestrians.

• With 2 separate ramps pedestrians cross at the
  same location.

4
Poor Design
Unexpected vertical drop.
Protect vertical drop or remove from pedestrian
path
Flare slopes.
Preferred Design
5
Poor Design
Preferred Design

• Perpendicular ramps without landings

(48 landing)
6
Poor Design
Preferred Design

• Ramps not perpendicular to curb.

Ramps perpendicular to curb.
7
Poor Design
Acceptable Design

• Wheelchair over run not provided.

Wheelchair over run provided.
8
Changes in Grade
9
Poor Design
Preferred Design
10
Level of Detail During Design
1 Layout crosswalk and stop bar locations
3 Determine ramp locations and types
2 Identify utility locations
4 Calculate ramp and flare slopes based on road
pitch and recommended slopes
5 Layout DWS accurately
Designers Ask yourself Can this ramp be
constructed given the level of detail provided?
Contractors Always request more information if
necessary.