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Car B would be at fault do to the fact that they failed to yield at a traffic light.
The vehicle exiting the parking space that did not yield to oncoming traffic.
I would say probably the person backing out, as they should of looked for any oncoming cars before backing out. ---- The person backing out of the driveway who did not yield to oncoming traffic.
Yield means yield. Oncoming traffic already on the road has right of way. You merge when it is safe to do so.
Depending on a city, but it doesn't mean you have right of way if there is one or multiple uncomming cars. Then it would be an illegal turn.
If you mean that someone was starting to merge into traffic and then they stopped and you rear-ended them, you would be at fault. If the person merging into traffic hit someone, the merger would be at fault because they failed to yield to oncoming traffic. These are typical scenarios. Other scenarios or circumstances may effect the outcome.
It is always the responsibility of the vehicle entering a flow of traffic to yield to the oncoming traffic. The striking vehicle could be found to be at fault but it would have to be an unusual circumstance.
Oncoming Traffic
You're still required to yield to oncoming traffic.
B is at fault. Drivers making a turn, must yield to oncoming traffic. B is at fault for making a left turn without yielding. There is no general rule that all turning traffic must yield, although some jurisdictions may have such a specialized rule.
The Difference between a merge and a yield is, when your merging, you are entering oncoming traffic with out stopping, and yielding s letting the traffic pass you and then going when the coast is clear.
It wouldn't matter if the oncoming car was speeding. When making a left turn you must always yield to oncoming traffic regardless of their speed.