You mean those signs are for their good looks? If they are not going to enforce it, take down the signs!Have you or anyone you know ever heard of someone being forced to vacate a rest area with a "no overnight" policy? Hard for me to imagine that if you were approached and said you were just too tired to drive, that you would be forced to leave anyway.
Those signs could kill a law-abiding citizen or get somebody else killed.
The west is MUCH more reasonable. We have many more rest stops and overnight parking is always allowed.
I recall signs in Utah that said drivers may stop on the side of the freeway to take a nap.
In some states in the SE you can drive for many hundreds of miles and not see a single place to stop for the night.
-Don- Reno, NV