[HotHotHeat]

“Up until the 1970s, at least in the U.S., interstate highway speed limits were quite high. They were set at 70 to 75 miles per hour [112 km/h to 120 km/h]. That’s what those roads were designed for in the 1950s,”

In the mid-’70s, the energy crisis prompted a slowdown across North America, including Canada, where it coincided with a switch to metric.

“They passed a national maximum speed limit, which was 55 mph and that was done for fuel conservation purposes. Not because there were safety concerns. And that lasted here for approximately 20 years.”

Never knew this.