Safe
A safe sidewalk surface should be even, without bumps, cracks or indents greater than 1/4 inch so as not to catch the tip of a cane or front casters of a walker or wheelchair. The surface should also be firm, stable, slip-resistant, and sloped for drainage, but not more than a 12:1 slope ratio.
A safe sidewalk should contrast in color or tone from the surrounding area. The walkway can be a different material, texture, or color to distinguish it from the vehicular traffic area. It does not have to be concrete or asphalt. A universally accessible surface, as defined by the ADA, may be composed of such materials as compacted earth, stabilized decomposed granite, playground surfacing, asphalt, brick, or concrete. Walkway edge treatments using accent paving are a good option to provide aesthetic treatments rather than having the whole walkway width textured.
Comfortable
To be comfortable, minimize long travel distances over aggregate concrete, pavers, or other materials that are rough or bumpy in areas where an alternative, smooth surfaced walkway is not an option.
Destination
Decorative sidewalk surfaces increase the attractiveness of the facility and can add to a character or architectural theme that defines a destination facility.
Resources
Accessible Route [4.3]
http://www.access-board.gov/adaag/about/4.3.htm
Chapter 4. Sidewalk Corridors, 4.3 Sidewalk Surfaces
http://www.fhwa.dot.gov/environment/sidewalk2/sidewalks204.htm
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