$(1$ point$)$ An unflared guardrail design is needed to protect traffic traveling either direction on a two$-$lane

road from exiting into the bottom of a steep, rocky ravine running under a bridge and then north$-$

south beyond the ROW. The road has a $60mph$ design speed, $12-$foot lanes, $6-$foot shoulders, and a $6$:$1$

foreslope. The roadway serves an ADT of $3,875$ vehicles per day. The guardrail offset from the shoulder is

$2$ feet.

$($Hint: There will be $2$ pairs of matching guardrails, one pair on each side $($north and south$)$ of the road.$)$

$3$a$.$ What is the distance to the edge of the

guardrail in feet for the directional and

opposing travel lanes, respectively?

a$.12,20$

b$.8,20$

c$.11,30$

d$.15,16$

e$.8,30$

$3$b$.$ What is the runout length $(L_R)$ in feet?

a$.210$

b$.170$

c$.150$

d$.180$

e$.220$

$3$c$.$ What total length of guardrail needed

along the directional travel lane in feet?

a$.192$

b$.96$

c$.384$

d$.203$

e$.197$

$3$d$.$ What is the total length of guardrail

needed in feet?

a$.192$

b$.96$

c$.384$

d$.203$

e$.197$