An isolated intersection has a pretimed four$-$phase signal with the movements allowed in

each phase and corresponding analysis and saturation flow rates shown in the following

table. Assume the phasing and timing takes the minimum$-$cycle$-$length plan $(70$s$)$ from the

previous homework, and the lost time is $4$ s per phase.

a$)$ Calculate the northbound average approach delay and level of service.

b$)$ Calculate the southbound average approach delay and level of service.

c$)$ Calculate the westbound average approach delay and level of service.

d$)$ Calculate the eastbound average approach delay and level of service.

e$)$ Calculate the overall intersection average delay and level of service.