Catawbalea - there is another route that goes up and over to Cedar City and then back down I-15 to the Zion exit. Kolob Canyon - another part of Zion NP is in that area north of the main park and may be worth a stop and view. I imagine this route would add at least an additional hour or more to the trip between the two parks. It might be worth calling Zion NP and asking the Rangers about the actual restriction. I didn't pursue it since I wasn't interested in taking my TM over to Bryce.
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