BTW Yellowstone is currently undergoing some major road construction so there are areas where traffic is backed up and the roads are soft loose gravel. If a rally segment was to include a ride through YNP then road conditions should investigated before hand, unless you happen to like long lineups on soft gravel. This year the area around Fishing Bridge which is not far from the [East entrance] from Cody is under construction. A lot of remediation work is planned for the park.