I always square my corners. There's an intersection by my office that I take every morning on my way into work that I turn left from a one-way onto a two-way. I've often seen people cut this corner so badly that they actually jump the curb on the oncoming traffic side! It's just nuts. There's near-accidents at this intersection all the time as the turning cars think they have the right to plow into the lane of traffic that is coming to a stop at the stop sign.
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