Evaluate two phasing schemes for the intersection and traffic loads illustrated in the igure below: $($a$)$ two$-$phase operation: north$-$south $($phase A$),$ east$-$west $($phase B$)$; and b$)$ a three$-$phase operation: north$-$south $($phase A$),$ east$-$west left tums $($phase B$),$ and east$-$west right turns and through $($phase C$).$ Take lost times equal to $3$ seconds per phase and amber equal to $4$ seconds. The following saturation flows prevail: $[$ s$($TH$,$ RT$,$ LT$)=1200$; s$($TH$,$ RT$)=1700$; s$($TH$,$ LT$)=500($LT permitted$),$ and; s$($LT$)=1700($LT protected$).]$ Select the best of theses two phasing schemes $($must furnish quantitative proof other than cycle length which is not a description of efficiency$).$

Evaluate two phasing schemes for the intersection and traffic loads illustrated in the figure below:

$($a$)$ two$-$phase operation: north$-$south $($phase A$),$ east$-$west $($phase B$)$; and

b$)$ a three$-$phase operation: north$-$south $($phase A$),$ east$-$west left turns $($phase B$),$ and east$-$west right turns and through $($phase C$).$ Take lost times equal to $3$ seconds per phase and amber equal to $4$ seconds. The following saturation flows prevail:

$s(TH,RT,LT)=1200$

$s(TH,RT)=1700$

$s(TH,LT)=500(LT$ permitted$),$ and

$s(LT)=1700(LT$ protected$).$

Select the best of theses two phasing schemes $($must furnish quantitative proof other than cycle length which is not a description of efficiency$).$