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Re: “UPDATED: Cyclist dies following downtown accident

Based on what evidence did the cyclist "move over?" That idea obviously comes from the driver and is a faulty perception. Here's what's more likely. You're going to want to overlap a big circle onto a little circle to visualize this.

Both were traveling south and therefore making left turns onto Montagu; car behind the cyclist. The cyclist has a much smaller wheel base and can make a much tighter turn with a smaller radius to its turning arc. The car, with its wider wheel base cannot make as tight a turn as the cyclist and turns with a bigger radius to its arc. It should also be noted that a cyclist can make this turn at a higher velocity than a car. If a car attempts to keep the same speed as a cyclist while making the same turn, the car's tires will squeal and the car's turn will go wide because it's going too fast for the turn.

If both vehicles are executing their turning arcs, its very likely the car's bigger arc overtakes the cyclists smaller arc at a point on the car's passenger side.

From the driver's perspective it would look like "the cyclist moved over" when in actuality both are simply converging on the same spot as they complete their turns. It's like when you're sitting in your car at a redlight and all the cars are stopped. Out of the corner of your eye the car next to you moves forward slowly and you have the quick sensation that it's actually your car moving backwards. Same thing here, it's not that the cyclist veered over, it's that both vehicles converged to the same point at the end of their turning arcs.

In which case it's the driver's fault for attempting to pass another vehicle while executing a left turn. She should have stayed behind him the whole time instead of trying to pass during a turn.

1 of 1 people like this.
Posted by bym on July 24, 2010 at 7:53 AM

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