2. An intersection has a four-phase signal with the movements allowed in each phase, and corresponding analysis and saturation flow rates shown in Table below. Calculate the optimal cycle length, green, yellow, and all-red intervals for all four phases. Assume approach speed of 40 mi/h, intersection widths of 36 ft (NB and SB approaches) and 60 ft(EB and WB approaches). Assume left turns are of 60ft length and made at a speed of 20mi/h. Also check if the green intervals for through movements are sufficient for pedestrians to cross. Assume startup lost time = 2 sec, clearance lost time = 2 sec. Assume zero grade.No. of pedestrians crossing during an interval= 10, and crosswalk width (We) = 8ft.