Well, this is an interesting story that's come out over the last few days: To try and combat congestion along roadways, Chinese transportation planners have developed a bus which is able to straddle cars and drive over them.
It's an intriguing system: Stations are actually on top of the straddle-buses, and doors open to reveal a staircase riders will descend to get into the bus. It runs along tracks, never switching lanes, and there seems to be some sort of warning system for cars driving underneath the bus. The video embedded below explains it a little better (although it is narrated in Chinese, it's still easy to see the idea behind it).
This is something I've dreamed about being able to do, while stuck in traffic: Having my wheels extend from the chassis of my car, and let me drive over the cars holding me back. (In fact, I think it's something Inspector Gadget was able to do with his vehicle.) But I'm not sure if it's really something that would work for Ottawa, or any Canadian city; construction of this system is going to begin in Beijing, a hugely dense city with a population almost two-thirds that of Canada. Still, an ingenuitive solution to a difficult problem. It will be interesting to see how well it works out.