07/31/09 - posted by Steve
That is right about the bumpers. They were available for cars too, and I think some taxis had them. They were demonstrated on television.

These were plastic, filled with water and had covered or plugged holes on top. On car they were one piece, while on the Muni there were several in a row. Upon hitting something, the bumper would collapse in a controlled way by releasing the water out the holes (as water cannot be compressed). It was entertaining to see the demos with the geysers of water shooting upward.
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