Entering off a ramp at 30 under the speed limit would indeed be idiotic. My MIL is one of those - but I actually see very little of that. The ramp I mentioned earlier is uphill steep enough that some of those lacking in power do good to get up to about 55 in a 65 though (also some commercial vehicles that barely make 45), and it amazes me that so many drivers - many of them "professional" - do nothing to allow them a safe entry. Yeah - I avoid that on-ramp if I'm pulling a load...but not everyone knows how bad it is before they're committed.
