It's not the tunnel, it is the whole road!!!! Go early morning if you want to have the vistas to yourself, changing after every corner you take. Watch out for the wildlife as well, we saw loads; California Condor, dear, chipmunks, rattle snakes, lizards, etc. If you plan to visit more then on National Parks get an "Amerika the Beautiful"...
It was one of the longest tunnels I've ever driven through, but it wasn't unbearable at all. The numerous "Windows" along the tunnel gave us some peaks of the beautiful mountain. I really love this drive.
the road to the tunnel from both ways enables you to stop off and take photos and offers gorgeous sites of the mountains. the tunnel is dark, so lights on, although there are a few cutouts to offer a little light (not much). it is so cool to drive through...we did it twice. fabulous drive for the entire family.
ok, ill admit, i was the passenger when it came to this part of my trip. my mother was driving us through Zion to the Mt Carmel junction. if you are afraid of heights, or not so sure about your car brakes i would not suggest driving up to come back down. the tunnel is narrow so one lane is...
While in Zion, be sure to take the road to the tunnel. Even better, if, after entering the park, the lines for the shuttle from the Visitor's Center exceed 90 or 120 minutes - a LONG wait to take a shuttle bus - get back in the car and drive to and through the tunnel. Terrific ride.