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10 crosswalk 15 sidewalk CCI estimates Crosswalk Condition Index Formulate Policy Interventions Indian cities Pedestrian Crash-Prone Locations SCI Sidewalk Condition Index Urban and Regional Planning not elsewhere classified calendar years crash-prone locations crash-prone sidewalk crosswalk attributes crosswalk illumination crosswalk infrastructures crosswalk locations hierarchy process intersection control refuge islands research findings sidewalk attributes sidewalk lighting sidewalk quality signal timing study locations sum method traffic speed walkability condition zebra crossings