What's up with truck speeds regulated to 25 on I-90?

Somewhere in there, going downhill, I'm being slowed down by the black & white signs to 25 mph, with cars coming around the corners behind me at full speed... wtf? Whatever happened to reasonable and prudent...

 

Yeah, and it took us about that long to get down the pass...


Whatever, I drove through Canada (on narrower roads with similar hills and tighter turns), in the winter, with even less experience, and had no problems gearing down for recommended 20 kph (or so) corners from 90+ kph speed limits (while these look like 55 mph would be a good start)... this is a sick joke (slower than a construction zone, in the summer no less), I'm going past a runoff ramp at 25 mph, toying with the idea of pretending to lose control and take a lunch break there. They should at least slow down all traffic to within 10 mph to be safe—I'd rather not find out how much of an impact my underride protection can take, before decapitating a driver, being that people pass me from no farther away when going more than twice my speed, but of course, someone will have to die for them to find a happy medium between bad driving and worse regulation.

 

Out of concern (or morbid curiosity), I looked up underride impact tests, and it seems to me (and probably them) that this difference between car and truck speed would be a recipe for disaster (being that the impact would be even greater here and neither vehicle is generally rated for that, if any are considered safe in this case).

 

I almost did get rear ended there, so it wouldn't surprise me if it's only a matter of time...

And the sad truth of the matter (besides how pathetic our doing 25 mph is there), is that it would probably take another celebrity's headshot on an obituary, literally (which is what brought underride protection into being), to change any of the laws to do with this situation, regarding both under-, and over-regulation, that or several deaths of mere mortals to be newsworthy.

 

Yeah, well someone can't necessarily go too fast behind me going too slowly, so I guess they'll have to kiss my axle, just saying (truck descents have changed in 40 years, or so I'm told, in newer trucks anyway, if all else fails use the brakes), and why is the speed limit not < 35 mph for commuter vehicles if everything pretty much gets squished from there? Maybe it has to do with relative speed, as it is, the difference here would greatly reduce reaction time around a corner, especially if the other lane is blocked (and we're not talking about professional drivers in that case). Crash test dummies should be our celebrities methinks (relatively speaking, she died on US 90, among others).