A two$-$lane approach to a signalized intersection gets $40$ seconds of green out of a cycle length

of $100$ seconds. Studies show that the saturation discharge headway at the intersection is equal

to $2\mathrm{.}3$ seconds. Assuming that the start$-$up lost time is equal to $2\mathrm{.}6$ seconds, the clearance lost

time is equal to $1\mathrm{.}5$ seconds, and that the duration of the yellow interval is equal to $3\mathrm{.}8$ seconds,

the capacity of the approach is:

$621$ vehicles per hour

$818$ vehicles per hour

$1242$ vehicles per hour

$1636$ vehicles per hour

$1863$ vehicles per hour

$2454$ vehicles per hour