Zion Canyon Scenic Drive Introduction: The Zion Canyon Scenic Drive provides tourists with a passage from Springdale to Zion Canyon. In the 1990s, traffic congestion at the canyon passes became so severe that a public transportation system was introduced in 2000, using shuttle buses powered by propane. From April to October, private cars are not allowed to pass through the scenic corridor of Upper Zion Gorge, and tourists must take frequent shuttle buses. This plan restores the natural serenity of the Upper Canyon area.