The federal agency with some authority to impose safety measures the National Highway Traffic Safety Administration didn't immediately endorse the standards, though a spokesman said NHTSA is interested in ways to reduce the number of drunken drivers.

WSJ: New Threshold Urged on Drunken Driving

The national limit was raised to 65 mph in 1987 and authority to set highway speeds reverted back to the states in 1995.

FORBES: Why Speed Limits Are Rising