This intersection is a $4-$way intersection as shown above where Light $1$&$2$ are seen by

traffic going East$/$West $($major road$)$ and Light $3$&$4$ are seen by traffic going

North$/$South $($minor road$).$

Light $1$ and Light $2$ are synchronized $($will display the same$)$

Light $3$ and Light $4$ are synchronized $($will display the same$)$

The behavior of the controller should behavior as:

a$.$ Light $1$ & $2$:

i$.40$ seconds dwell on green

ii$.5$ seconds on yellow

iii. $20$ seconds on red

b$.$ Light $3$ & $4$

i$.20$ seconds dwell on green

ii$.5$ seconds on yellow

iii. $40$ seconds on red

c$.$ When Light $1$&$2$ are green, Light $3$&$4$ must be red

d$.$ When Light $3$&$4$ are green, Light $1$&$2$ must be red

e$.$ When Light $1$&$2$ turns yellow, Light $3$&$4$ should stay red

f$.$ When Light $3$&$4$ turns yellow, Light $1$&$2$ should stay red

Assume clock period is $5$ seconds

There will be $6$ outputs:

a$.$ L$12\_$EW$\_$Grn

b$.$ L$12\_$EW$\_$Yw

c$.$ L$12\_$EW$\_$Rd

d$.$ L$34\_$NS$\_$Grn

e$.$ L$34\_$NS$\_$Yw

f$.$ L$34\_$NS$\_$Rd

At any given time, these signals should follow the rules specified in $4)$ c$-$f above.