Dawson City Ferry

 When you get to Dawson City, Yukon - the highway crosses over the Yukon River - except there is no bridge.  Instead, there is a ferry.  No charge to ride it, but you have to wait your turn.  We used the ferry three times, since we camped across the river from the town.

You just drive right on and park where they tell you to.  You sit inside your vehicle for the 5 minutes or less that it takes to cross over to the other side.