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At least where I drive, taxis drive very aggressively and will win at chicken with me everytime. Sometimes professional means in tune with the equipment and willing to drive at the edge of its capability.

Busses are big and may not stop quickly. If traffic is tight enough that I need to force my way into an opening, traffic may stop suddenly and I don't want to find out if the bus can stop behind me, because if not, I need to shop for a new car and new pants. If things are moving very slowly, then yeah, you can cut them off.