I would consult with an attorney in your area. From what you've described, it sounds like vehicle 2 was not negligent; and, in turn, would not be liable for any damages. However, more facts would be needed to answer your question more thoroughly. Good luck to you!
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It does sound as though vehicle 3 is responsible for what sounds like a typical chain reaction, rear end collision. The fact that the vehicle 3 took off is also some indication of this as well. All that being said, you've only provided very limited facts and consultation with a personal injury attorney is recommended. Good luck.
Generally the rear-most vehicle bears all, or most of, the blame.
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