-) A three-phase pre-timed signal system is to be designed to have a standard amber period of 3s and all-red period of 2s for each phase change, for the intersection shown below. Using the data in the table below and Webster's method, determine i. The Optimum cycle length and the green time to be allocated to each phase (CR,10) ii. Diagrammatic representation of signal sequence (EV,5) Lane Assume the volumes in the table to be design hourly volumes (DHV). B Phase Critical group volume (pcu hr) 351 424 Saturation flow (pcu bir 1800 1800 1 1600