The landmark highway, constructed in the 1920s and ‘30s, is listed on the National Register of Historic Places and is designated as a Historic Civil Engineering Landmark.
Beginning in mid-2026,vehicles that exceed 11 feet and 4 inches tall and more than 7 feet ten inches wide and 35 feet, 9 inches long will have to use alternate routes.
The ban will also apply to vehicles that weigh over 50,000 pounds.
In a press release, the park says its goal is to reduce the chance for collisions and lane-crossing by vehicles too long to negotiate turns.
The ban will also increase safety on bridges and in tunnels, which larger vehicles cannot pass through while maintaining two-way traffic.
