That's also slower than every freeway speed limit in Europe for cars. Trucks just have a lower speed limit. They are also limited to 80 km/h where cars are limited to 90 km/h.
IIRC trucks also get special speed limits (usually to 80 or 70) on some difficult highway spots, they also often et additional semi-dedicated “slow vehicle” lanes on climbs.
Look at those signs- 65 is the limit for trucks, you have cars pushing 80, and some drivers like the one interviewed in the article driving 70. A higher variance in vehicle speeds makes traffic less safe.
That speed limit is widely flouted on rural highways in California and other States don't observe it at all. Typical max speed limit for trucks in the US is 70 or 75 mph, and a few States have 80 mph.
In the USA, I've seen even worse: trucks with a message printed on the back that their speed is governed to some constant value (usually 55, 60, or 65mph), that are driving on a freeway where the speed limit is higher than that. So naturally, you get a bunch of road rage and shoulder passes with the 55.1mph truck passing the 55mph truck, taking up both lanes, in a 70mph zone.
I recently returned from vacation in Chile, where I noticed the majority of freeways had separate speed limits based on vehicle class. Two axle private vehicles had a speed limit of 130 km/h while trucks were only 100, and double-trailer trucks were slower still.
Over the road trucks often have speed governors, some companies limit their trucks to 60 mph because it saves a lot of fuel and leads to a much (50%) lower risk of collisions.
Goods vehicles and trucks almost always have speed limiters in Europe that do exactly this. This leads to fun on the highway when one truck who's limiter is a mile an hour or two faster than the truck in front decides to overtake.
Part of the reason I like driving on the Autostrada in Italy is that trucks are speed-restricted. Their speed limit is posted on the back of the truck itself so it's easy for anybody to see if the truck is speeding, and I'm led to believe that the penalty for speeding trucks is pretty severe. This may also be true in other countries; I don't know. It's not the case in the US and I wish it were.
They are also so that cars can get on the highway (some older cars or larger cars can't get to 140). Then you have trucks that have 80/90kph max. The differential gets large.
And then there is the issue of noise and particles in the air. Cars are most economic around 80kph.
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