I've long wondered whether any one had ever done some sort of mapping to see routes that people take on roads with speed cushions rather than speed humps and see if it leads to a weaving wiggly line. Near my house most of the streets have these, and on many cars are parked on either side, so people tend to swerve to the centre of the three cushions to lighten the shock on their suspension.
Hell, I do it myself.
But this morning there was a strange occurence en route to work. I was moving out to pass a parked car just before three speed cushions, two cars coming the other way, and their side of the road completely free. Suddenly the car in front swerved right to go over the centre cushion rather than the left.
This came as something of a surprise as given I was overtaking a parked car I was suddenly presented with a car which, to all intents and purposes, was headed straight for me. She then swerved back in left as I looked back bemused after an adjusted avoiding action, with the driver behind, who had stayed left, presumably equally bemused.
There are three causes as far as I can see: 1. stupidity coupled with a sort of 'learned reaction' to speed cushions; 2. done deliberately to 'scare' the cyclist; 3. she may have been overtaking the other car at the moment I checked behind to make sure it was alright to pull out to overtake the parked car, but she seemed to be going no faster than the car behind.
All very odd.