Yellowstone has more than 350 miles (564 km) of roads. Most are narrow, rough, and busy. Some sections are steep with sharp drop-offs. Drive cautiously and courteously. Slow moving vehicles must use pullouts to observe wildlife or scenery and to allow safe passing by other vehicles. Watch for animals on the road, especially at night.
Bicycles and motorcycles present special hazards. Drive defensively and wear seat belts. Yellowstone has a mandatory seat belt requirement for all passengers. Be especially cautious of ice and road damage. Cool temperatures may occur at any time of the year. The maximum speed limit is 45 mph (73 km per hour) unless posted otherwise.