回复：问懂行人一个问题。今天在市区开车，在一个不大的十字路口最左边道等红灯变绿灯，准备左拐

Yes, left turn car in front of you should yield.  Most likely the right turn car was too slow and the driver of left turn car was not patient so he/she just proceeded and made the turn.  If the right turn car is too slow and the left turn car had enough time to make the left turn well before the right turn car approchs, what's the point of yielding?  He/she should wait though.