I've seen mention of, but can't find specification for, FIM approved paints for track curbing and grid markings. Maybe a rider makes a bad decision on corner entry speed or direction - yeah that's on the pilot. Wouldn't look to blame any govt. But sometimes other nonsense in the road, for whatever reason, could cause need to cross some line drawn in paint or tar. Maybe even just the dashed lines separating multi-lane roads could cause a slip. This sort of thing wouldn't eliminate a rider at the limit going down - we've all seen top level racers go down when tracking into the painted area of an apex or, even the painted corner exit curbing. But if the balance of cost to an agency or state is similar or preferably less to use a different compound, especially when factoring EMS and whatever other costs involved, maybe it's worth looking at the stuff we draw lines on the road with.