The geometric and traffic characteristics are shown below, determine a suitable signal phasing system and phase lengths for the intersection using the Webster method. Show a detailed layout of the phasing system and the intersection geometry used. North South Approach 56 ft Approach 56 t East Approach West Approach 68 f Approach Widih Peak-hour approach volume Left turn 133 I68 563 169 0.95 73 134 Through movement Right turn PHF Confilicting pedestrian volume 900 ped/hr 1200 ped/hr 1200 ped/hr 900 ped/hr 373 135 0.95 420 140 516 178 0.95 0.95 Assume the following saturation flows: Through lanes: 1760 veh/In/h Through and right lanes: 1540 veh/In/h Left lanes: 1100 veh/n/h Left and through lanes: 1320 veh/In/h Left, through, and right lanes: 1210 veh/In/h

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a)  A lane merge warning sign (shown below) is being installed near an entrance ramp on a freeway with operating speeds of 80 mph. Calculate the appropriate advance placement distance (to the nearest foot) for the sign assuming a perception-reaction time of 14 seconds for the vehicle avoidance maneuver.  b) A curve or turn warning sign is to be installed near a single curve with a 28 mph design speed (per ball-bank indicator) on a rural 2-lane roadway. The prevailing speed of traffic on the approaching tangent section is 62 mph.  Calculate the advance placement distance upstream of the curve PC for this sign (to the nearest foot).  Also indicate the appropriate sign to be used (curve or turn) and the appropriate safe advisory speed if one is to be posted for this curve.

Subject : Transportation engineering Please give me right solution according to the question...