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$3.$ For the target arterial segment, there are $2$ lanes in each direction. And the progression speed is $40f\frac{t}{s},$ the headway is $2$ secs$.(20$ Points$)$

$\backslash$table$[[,1,1,1,,,,],[0,10,20,30,40,50,60,70]]$

Determine the efficiency of the system in each direction and the bandwidth capacity