For each phase, the startup lost time is $2\mathrm{.}5$ seconds and the clearance lost time is $1\mathrm{.}5$ seconds. The

speed of traffic is $40$ mph on all approaches, the design vehicle is $20$ ft $,$ all lanes are $12$ ft wide,

and all approaches are on a level grade. The desired degree of capacity utilization is $0\mathrm{.}95.$