$6\mathrm{.}27.$ Traffic Control Devices $-$ Lane lines on intersection approach. The three SB lanes on Northwestern Avenue $($as it enters the $"$T$"$ intersection with Cherry Lane$)$ are marked as shown in the figure below. $($SB traffic moves from right to left in the figure. Lines $"C-C"$ represent the curb; it flares out to form a right turn only lane. Line $"$D$-$D$"$ is the stop line at the intersection.$)$

A$.$ What color should the double solid centerlines $"$A$"$ be$?$

B$.$ What color should the dashed lines $"$B$"$ be$?$

C$.$ The City Engineer wants to try to "help" SB drivers decide whether to stop immediately upon seeing a yellow indication on the traffic signal. He wants to convert the last $x$ feet of the dashed line $"$B$"$ separating the two lanes of SB through traffic into a solid line. If the signal turns yellow before the driver reaches the solid portion of the line, the driver should stop. Otherwise, proceed at a legal speed. If the speed limit is $30mph,$ but drivers typically approach the intersection at $35mph$ and the approach is $2$ percent downhill, how long should the solid line be$?$ Assume driver reaction time is $1\mathrm{.}5sec$ and the coefficient of friction Is $0\mathrm{.}35.$