Slope [4.3.7]
Requirements in 4.3, while based on the expectation of level floors, apply equally to exterior sites. Where the running slope of an accessible route exceeds 5% it must be treated as a ramp or curb ramp.
A maximum cross slope of 2% is recognized for drainage. Steep cross slopes make travel by wheelchairs, including many power chairs, difficult by causing front casters to veer. They also disrupt the balance of force used in propelling both wheels of manual chairs. Keep in mind that where routes cross, the running slope of one acts as a cross slope to the other.
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