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The figure below shows hourly design volumes for a major intersection on an expressway. Using the Webster method and the four$-$phase system shown below, answer the following questions: Note: there are $2$ lane groups in each phase.

$\backslash$table$[[$Phase$,$Lane Group,Saturation Flow$],[A,(1)$ longrightarrow,$1615],[(2)$ longrightarrowlongrightarrow,$3525],[$B$,(1),3525],[(2),1615],[C,(1),1615],[(2),3525],[D,(1),1615],[(2),$uarrgrad,$3525]]$

$1\mathrm{.}1$ Calculate flow ratios for each lane group and identify the critical movements. Complete the following table to help you find the flow.

$\backslash$table$[[,$Group,v$,$s$,$v$/$s$],[$Phase A$,1,,,],[,2,,,],[$Phase B$,1,,,],[2,,,],[$Phase C$,1,,,],[2,,,],[$Phase D$,1,,,],[,2,,,]]$

$1\mathrm{.}2)$ Calculate the total lost time using $3\mathrm{.}5$ seconds of lost time per phase

$1\mathrm{.}3)$ Calculate the optimum cycle length

$1\mathrm{.}4)$ Calculate the total available green time using your answers from $2$ and $3$

$1\mathrm{.}4)$ Using the four critical lane movements identified in $1,$ calculate the green time for each phase