riers tend to snag
. Steel cable barriers in highway medians are a lowcost way to improve traffic safety without
busting state department of transportation budgets. Cable barriers cost $44,000 per mile,
compared with $72,000 per mile for guardrail and $419,000 per mile for concrete barriers.
Furthermore, cable barriers tend to snag tractor-trailer rigs, keeping them from ricocheting back
into same-direction traffic. The state of Ohio spent $4.97 million installing 113 miles of cable
barriers. If the cables prevent accidents totalling $1.3 million per year, (a) what
does this represent if a 10-year study period is considered? (b) What is the rate of return for
113 miles of guardrail if accident prevention is $1.1 million per year over a 10-year study
period?
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