The tunnels of Iron Mountain Road has to be the most impressive part of your 17 mile motorcycle journey. The tunnels frame Mount Rushmore, an incredible sight to see. It is common to see motorcycles parked on the side of the road so bikers can take that perfect picture.
The tunnels, three of them, are one lane. You will see a “honk your horn” sign as you enter the tunnel to make sure another car or motorcycle isn’t coming from the other side.