Since the summer of 2007, the park has operated a free shuttle bus along the Going-to-the-Sun Road (buses every 15–30 minutes 6:45 a.m.–11:45 p.m. July 1–Labor Day). Although you are still allowed to drive along the road, the shuttle is a great option if you’re out for sightseeing or hiking.
Since 2004, Going-to-the-Sun Road has been the site of extensive road repairs (it’s a high-elevation road built during the era of Model T Fords, and it direly needed attention). The shuttle is one way to avoid some of the construction hassle and to avoid the environmental impact of heavy auto traffic.
© W.C. McRae & Judy Jewell from Moon Montana, 7th Edition