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Consider the tabulated intersection design data below, then the number of vehicles stopped during the red interval for Phase EW is about vehicles. Assume that Qs is 2000 vphpl and use Webster's method procedure. .............. ts (sec) Qa (vph) Lane 1 Lane 2 500 600 650 550 300 250 Yellow (sec) 2 2 2 All-red (sec) 2 Phase N Phase S Phase EW 2 3 NN 2 1 2 2 a. 13 O b. 10 c. 6 o o d 8