36 CFR Part 1190, Proposed Accessibility Guidelines for Pedestrian Facilities in the Public Right-of-Way: Notice of Proposed Rulemaking (NPRM)
R202.3.3 Reduction in Access Prohibited. An alteration shall not decrease or have the effect of decreasing the accessibility of a facility or an accessible connection to an adjacent building or site below the requirements for new construction in effect at the time of the alteration.
Advisory R202.3.3 Reduction in Access Prohibited. Sidewalk improvements that correct existing excessive cross slope should be carefully planned to avoid creating excessive slope in curb ramps or adding a step at existing building entrances. Solutions may include:
• Split sidewalks that serve building entrances and street or highway at separate levels;
• Sidewalks with greater cross slope along the curb and pedestrian access routes with lesser cross slope along building fronts;
• Pedestrian access routes along the curb and ramped entrances to buildings.
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