A dual carriageway runs North (N) and South (S) and is intersected by a single carriageway running East (E) and West (W)

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A dual carriageway runs North (N) and South (S) and is
intersected by a single carriageway
running East (E) and West (W). The layout of the intersection is
such that there are two
straight lanes of 3.5 m width and exclusive right turn lane in each
of the Northern and
Southern approaches. Width of the East West carriageway is 12 m.
Design a 3-phase signal
system (using Webster’s method) for the data given below and draw
the phase diagram. Assume any data required if not given, however,
highlight your assumption in the answer
sheet.