Bombardier did make street legal golf carts, signals, brake lights, etc. They cost a good bit, but were street legal as to "older vehicle" safety equipment.
Texas did have a very detailed publication of how to legally build a "kit car", as in a Miami Vice "car" using a Corvette chassis, for example. I have no doubt this also included "build-it-yourself" kit cars, too.
I've seen a multi-passenger ATV running around my neighborhood in town, on weekend afternoons, headed toward the local convenience store. Probably not "legal" as such, but I also feel the driver has more sense than to get on a busy street in it.
While the classic dune buggy looks neat and has its own following, especially near the coastal beaches, to try to regularly drive on in traffic has its perils! That steel tube frame might look tough, BUT against an 8000lb HD2500 diesel pickup with an aftermarket front bumper replacement/grille guard, at normal OEM ride height. If it's been "lifted" 6", on top of that, visibility of the smaller vehicle CAN become a problem! Even with the requisite beach flag on a stick on the vehicle, that can still get lost in traffic or against other backgrounds other than sand.
Then figure in the bare-bones safety things (who knows what hand signals mean any more? other than the "1 finger salute"???) Smaller stop lights, non-fixed-aim headlights, etc.
The ONE time I rode in one, strapped into a padded fiberglas racing seat, I decided I wanted more sheet metal around me. They have their place, but not on our increasingly-crowded streets. Streets increasingly-populated with "hi-ride" HD2500 4wd pickups.
There's a LOT more involved than just scant safety equipment or exhaust emissions. How quickly might one vanish into Dallas rush hour traffic on LBJ Freeway at 6pm, just after sunset this fall? In this case "vanishing" can be detrimental to the physical integrity of the driver of the "buggy".
CBODY67