$7\mathrm{.}7$ For Problem $7\mathrm{.}1,$ calculate the optimal cycle length $($Webster$\text{'}$s formulation$)$ and the corresponding effective green times $($based on lane group $\frac{v}{c}$ equalization$).$ Assume lost time is $4$ seconds per timing stage.

$\backslash$table$[[$Timing stage,$1,2,,3],[$Allowed movements,NB L$,$ SB L$,NB\frac{T}{R},SB\frac{T}{R},$EB L$,$ WB L$,EB\frac{T}{R},WB\frac{T}{R}$