$7\mathrm{.}47$ For Problem $7\mathrm{.}8,$ calculate the overall intersection erage delay $($using Eqs. $7\mathrm{.}27-7\mathrm{.}29)$ and level of Tvice.

For problem $7\mathrm{.}47,$ given

$d_{NB}=67\mathrm{.}2s$

$d_{SB}=63\mathrm{.}5s$

$d_{WB}=43\mathrm{.}2s$

$d_{EB}=41\mathrm{.}8s$