$(30$ Points$).$ Fault Tree and Threshold Change Analysis. In Templeton, MA$,$ the

$($fictional$)$ intersection of Royalston Road with Route $2$ has presented a safety problem to

the town; $6,000$ cars use the Royalston Road$-$Route $2$ intersection each year and there

have been several accidents there over the past decade, some of which proved fatal. Each

accident costs the town an average of $$150,000$ in road repairs, insurance claims, police

details, ambulance and EMT costs, and lawsuits. The town of Templeton has contracted

you to make some safety recommendations because of your expertise in this area. Your

staff has already developed a Fault Tree for this situation, which is presented below. $($You

will recognize this fault tree as the same one discussed during the Module $8$ lecture.$)$ You

may safely assume that the fault tree and all its data are correct and complete. Please use

a $10-$year planing horizon for this exercise.