Zion-Mount Carmel Tunnel
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The Zion-Mount Carmel Tunnel, constructed in the late 1920s and completed in 1930, was a pioneering engineering feat at the time, facilitating direct access from Zion National Park to Bryce Canyon and Grand Canyon. However, due to safety concerns stemming from accidents, the National Park Service implemented traffic management in 1989, converting two-way traffic into one-way flow for larger vehicles with rangers stationed at both ends. A $15 two-trip tunnel permit fee was introduced, and specific daily times were designated for large vehicle passage. Reinforcements, including concrete ribs, were installed to fortify the tunnel against the sandstone it traverses, with 24-hour electronic monitoring following a collapse in 1958. Spanning approximately one mile, the tunnel provides a dramatic transition from the scenic roads of Zion, featuring windows cut into its structure to offer glimpses of the surrounding landscape.