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Since you have an otherwise good driving record, it might be worth it to go to court. You may not get all the charges dropped, but it is likely that if you show up with proof of current insurance that at least you can get that charge dropped. The careless driving will be harder to dispose of, because even if you thought the officer was motioning you over, you still have an obligation to make sure the lane is clear and you can make the change safely. However, you may still be able to get a reduced fine or something like that given your good record. There is no guarantee, but it is fairly low risk. The only disadvantage to going to traffic court is you could get the same fines plus court costs. But typically, judges will cut a break for first offenders, and so it is generally beneficial to go and try to get a better deal than just paying the tickets.