noglider 

Yes, I do sometimes. I've learned that people don't like to be told they've done something wrong. So to convey my point, I try to remove anger from my voice. I phrase my criticism as a request. For example, I might say, "Could you please wait behind me before making your turn rather than cutting me off?" It's only possible to do this kind of thing when we are both stopped, so if the driver is moving, I don't bother trying.

Then again, I did yell at a taxi driver recently, because the problem was urgent. He was passing me closely and getting closer. He was right beside me with his window open, so I yelled, "Not so close, please, not so close!" and he did veer away. Again, this was phrased as a request.