The northbound approach of a signalized intersection has a downgrade of 3% (i. e., g=-0.03). the design approach speed is 45 mph. what is the recommended yellow time to the next 0.1 second? (b) if the width of the cross street (in the east-west direction) is 58 ft and the design vehicle length is 16 ft, what is the recommended all-red time to the next 0.1 second. (c) pedestrians are crossing the east-west street. the crosswalk that is marked to guide pedestrians walking in the north-south direction has a width of 10 ft. the design pedestrian volume is 22 persons/cycle. what is minimum time that should be set aside for pedestrians to cross?