Woe is me if we ever have to go to metric measurements in the US! I'm metrically challenged.
My first hands on experience came as a teen on a surfing trip to Baja CA. We got across the border to find that the toll road headed south had a speed limit of 100! Wow!
The old Chevy station wagon would only do between 85-90 mph without shimmying & shaking, but even at that, we were shooting by the few other vehicles...a truck...a bus...a police car...uh oh.
When he stopped us, we had to pay the fine (on the spot was the custom, computed by the exact amount of cash we had in our wallets), although we argued that we
weren't speeding. We never reached our destination, rather we had to take the old road back (no money for toll), dodging donkeys, chickens, dogs, & Mexicans at about 25 mph.
We made it nearly home before running out of fuel. When our older friend came with gas he explained to us..."No, 100 kph, you morons"