Do lower speed limits make roads safer? The following table gives speed limits and death rates

from automobile accidents in five selected countries:

Country US Britain Italy Japan Netherlands

Death rate $($per $100$ million vehicle miles$)3\mathrm{.}33\mathrm{.}56\mathrm{.}14\mathrm{.}75\mathrm{.}1$

Speed limit $($mph$)6570755560$