4 feet. A 3-ft pinch point is not acceptable. For sidewalks where the – width is less than 5 ft, a 5 ft by 5 ft passing space is required every 200 ft. 2. The grade (running slope) of the sidewalk shall not exceed the adjacent roadway profile grade. 3. A curb ramp running slope of 10% for a 6in. rise is not acceptable. - 4.