Vehicles exceeding a new size and weight limit will not be allowed on the Zion-Mt. Carmel Highway come 2026. Credit: Zion National Park via Facebook

ZION NATIONAL PARK, Utah – Beginning in 2026, Zion National Park’s main highway will be off limits for many large vehicles, including some big buses and RVs. According to a press release from the park, vehicles that exceed 11’4” tall, 7’10” wide, 35’9” long, or 50,000 pounds will not be allowed on the Zion-Mt. Carmel Highway.

Alternate routes around the park will still allow the larger vehicles, adding an estimated ten to forty minutes to most trips depending on location. The changes are an effort to reduce collisions, overweight traffic over bridges, and lane crossing due to vehicles being unable to navigate the smaller turns.

Along the entire highway, large vehicles cross the road’s centerline 18 times because the turn radius is too narrow, and bridges along the highway are rated for 50,000-pound vehicles. Additionally, the Zion – Mt. Carmel Tunnel currently requires that vehicles wider than 7 feet 10 inches and taller than 11 feet 4 inches be escorted through, as these vehicles block two way traffic inside the tunnel.

These changes reflect months of discussions to find the best way forward to manage the historic Zion-Mt. Carmel Highway and increase driver safety. Our goal is to protect drivers, meet modern safety standards and ensure the integrity of the road and tunnels so that we continue to enjoy scenic drives on the historic Zion-Mt. Carmel Highway.” – Jeff Bradybaugh, Zion National Park Superintendent

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