Q$9.$ Design a traffic light controller for the T$-$shaped intersection where East Campus Loop deadends into Holdrege St $($Currently there is no traffic light there$).$

Two sensors are placed on Holdrege: one pointing at cars on the side going east, and the other at cars going west. Another sensor is placed on East Campus Loop, pointing at cars headed south. If a car is present where a sensor is pointing, the output of the sensor equals $1$ ; if not, sensor output equals $0.$

The controller you design takes the input from these three sensors and outputs a $2-$bit code. The higher bit of $1$ indicates a greenlight on Holdrege $($assume no turns, traffic flows east and west only; and $0$ indicates red$).$ The lower bit of $1$ indicate a greenlight on East Campus Loop $($all traffic either turns right or left; and $0$ indicates red$)$

$1.$ If there are no cars present on either street, both traffic lights should be red.

$2.$ If there are cars on either street, the light for the respective street should be turned green.

$3.$ If there are cars on both streets, preference is given to Holdrege for a green light.

$4.$ At any time, the lights cannot be simultaneously green on both streets.

This is a typical real world design problem. Draw a situational diagram to enhance the understanding of the problem first.

$($a$)$ Construct a truth table for the control logic. $(5$ pts$)$

$($b$)$ Develop a simulation program in LabVIEW to verify your logic. $(5$ pts$)$

Simulation of Traffic Lights

Sensor $1$ at Holdredge $($Pointing at cars going east$)$

Sensor $2$ at Holdredge $($Pointing at cars going west$)$

Lights for Holdredge

Light for east campus loop