August 26, 2018 - reviewed by CSW
Zion is an awesome place that road was built in the 1920s and tunnels. The tunnel is 11-4 One way traffic at a time so big RVs and trucks are not allowed heads up and some RVs can get through but it’s mostly for cars and pick ups.
October 23, 2017 - reviewed by Oliver
Vehicles taller than 11'4" require a tunnel permit, which costs 15$.