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Verbale di Cotestazione means you have a chance to dispute it but you have to take this seriously or the costs may escalate. You have not mentioned what the traffic infringement is for i.e. speeding or parking nor have you mentioned when the offence occurred.
But your options are as follows. If it is an offence you have committed the best option for you is to pay it and conclude matters. This is because the fees payable will double if you do not respond in a certain time and the matter is enforceable as the Italian authorities can instruct debt collection agencies to issue against you in a UK court.
If you dispute matters, you need to be able to evidence why you dispute it. Evidence means supporting documentation and not merely allegations. If it is a speeding offence there is a website available where you can actually see if you were the driver or not but my point is they would not have sent you the letter unless they were certain you were at fault therefore disputing it will also increase the fees payable, so if you are disputing it is essential you have evidence to show why you are not at fault.
If it is for speeding, Italian authorities have up to 1 year to issue the ticket. The 1 year starts from when they have knowledge you were speeding for example if you were driving a rental vehicle they would need to contact the rental company first to get your details and the 1 year will start from when the rental company passes on your details and not from the date of offence. The rental company are also under no obligation legally to inform you of this in time.
My advice to you is to pay it as it will be cheaper long term however if you feel you were 100% not at fault, then you’ll need to dispute it but ensure you have evidence to actually support this.
Please let me know if I can clarify anything for you. In the mean time please take a moment to provide a positive rating for me I would be grateful and do return to the site if you have any further questions. Kind regards, John.