Question $18$

$1$ points

A four$-$lane divided highway has a $12\mathrm{.}0$ ft median. The right shoulder is $4\mathrm{.}0$ ft $.$ The width of all travel lanes is $12\mathrm{.}0$ ft $.$ If $R=566$ ft measured to the centerline, what should be the $R$ value used to calculate $M?$

A$.566$ ft

B$.554$ ft

C$.542$ ft

D$.548$ ft