Handrail must be provided on any wall that supports roadway embankment where the wall
height exceeds the distance between the street-side face of the wall and the closest
edge of the sidewalk or, in the absence of a sidewalk, the back of curb. Handrail
must be provided on any wall not supporting roadway embankment if the ground surface
behind the wall slopes toward the wall and this surface is part of a park, playground,
single or multi-family residence. A chain link fence may be preferable to and substituted
for handrail in many of these installations.
A roadside barrier, such as metal beam guardrail or concrete barrier curb, must be
provided wherever the height of a wall supporting roadway embankment exceeds 6 feet
(1.8 meters) for local streets and 3 feet (1 meters) for collector and arterial streets,
or the distance between the back of curb and street-side face of the wall is less
than 10 feet (3 meters), regardless of street classification. Roadside barriers must
be designed according to the latest editions of AASHTO Roadside Design Guide and AASHTO
Standard Specifications for Highway Bridges
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