I don’t think it matters what he knew or didn’t know.When one sees a police roadblock you’re obliged to assume there’s a good reason and you’re required obey any orders you receive.
Well consider this....going from tournament to tournament I would imagine these golfers see traffic cones, police emergency lights and traffic being controlled by police almost on a daily basis.
The Players Championship at TPC is very close to where I live and during the tournament there’s always police everywhere.
I suspect he more than likely thought this was just one more routine tournament traffic situation. I’d also bet bypassing these situations is a very common thing for players to do.