A $3-$ phase signal controlled intersection is dessigned for a $4$ way intersection with a optimum cycle length of $101$ sec and actual gren times are determined to be GNST$/$R$=30$ sec$,$ GEWT$/$R$=33$sec and GL$=20$ sec$.$ According to the given data $($tsl$=2$ sec$,$ tcl$=3$ sec$)$

a$)$ Determine the effective green times for

each phase

b$)$ Which one of the left turns is proctedted

$($EWL or NSL$)$

C$)$ Drow the phase diagram

d$)$ Determine the missing peak hour flow

rate in the flow diagrom?