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In order for you to fight this, you would need some evidence to show that you were already halfway passed the bus as you stated before the lights were activated. This means you have to subpoena
the bus records to determine if they had an onboard computer or camera to show the incident, because most buses now have equipment that tells the time the emergency warnings are activated and also have video cameras on them. I have seen them even on private company school buses in Maine.
At this point, if you are convicted of this you risk having your restricted license revoked, so you really should consider using a local attorney because this is a little more involved for you than a regular traffic case and you have no experience as you said in court and this requires getting a subpoena or request for production of records to see if you can get evidence from the bus computer and camera to defend your case.
If no such evidence exists, it is your word against the school bus driver's word and if the driver does not show up in court to testify, you could get the ticket dismissed. Thus, you should plead not guilty and get the matter set for a hearing and in the meantime get the records from the bus if any exist to help defend your case.
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