« Reply #19 on: July 04, 2019, 11:38:32 AM »
Perhaps I'm misunderstanding, but my take on the sign was that it was a warning against traveling off-road. An alternative take would be no off-road vehicles (ie, 4-wheelers) allowed. It really is not very clear.
The obvious intent is to prohibit driving off the road; however, the NPS is masterful at an inability to state things with clarity.

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Wendell (Garret Dillahunt): It's a mess, ain't it, sheriff?
Ed Tom Bell (Tommy Lee Jones): If it ain't, it'll do till the mess gets here.
--No Country for Old Men (2007)