The normal flows on two approach roads at an intersection are respectively 500 pcu/h and 300 pcu/h. The corresponding saturation flow is 1600 pcu/h on each road. The total lost time per single cycle is 16 s. The optimum cycle time by Webster’s method is

• A. 72.5 s
• B. 58.0 s
• C. 48.0 s
• D. 19.3 s