Self-Steering Buses

While doing research on driverless highways, I ran across this video of a self-steering bus in Adelaide.

The bus line is called the “O-bahn” with O standing for omnibus (which was abbreviated to bus about a century ago) and bahn being German for road. Interestingly, it relies on a mechanical device to keep the bus on the track. As shown below, a small wheel projects from each side of the bus. When the wheel hits the concrete curb on the side of the roadway, it turns the bus wheel slightly. The driver controls the speed and steers the bus when it leaves the bahn.

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