In 2011, the Ohio Turnpike raised its limit to 70 and recorded its lowest traffic fatality rate ever that year. The higher speed limit attracts travelers to use the safer, limited-access, divided highways of the interstates from more traditional roads. That makes both types of roads safer.
Why does increasing the speed limit on interstates make traditional roads safer?
|After this change there are less police patrolling traditional roads|
|After this change there are more police patrolling traditional roads|
|More travelers choose to use interstates which reduces the number of cars on traditional roads|
|Drivers attracted by the high speed limits of the interstates are reckless and getting them off the traditional roads makes those roads safer|