unpaid traffic ticket

It is just too difficult to tell. Yes Norway is part of the Schengen Agreement and may share records with Italy, but assumes that Italy actually entered a record, that the system will also bring up that record at immigration, and that the offense is even one anybody will worry about. Norway however is not part of the EU, so there may be no common enforcement. Just a lot of "ifs". You might try asking the Norwegian Embassy.

I agree with Paul. Basically who knows for sure? In this present age of huge data bases and computers I suppose anything is possible. If it was my decision, I would not worry about. Even going into Italy would be remote at immigrations but don't get a traffic stop.

You won't be denied entry. Not even in Italy.
The cities don't communicate that info to the immigration authorities.

Then again you could pay the ticket.

Disadvantages - you have to pay the money, and go through the bureaucracy.

Advantages - you will do the right thing, you can stop worrying (is it really worth it?), you won't - for sure - be turned back (surely much more expensive to throw away expensive plane fare), you will feel much better

Your choice...

Thank you all for your input. Nigel, i was told by my car rental company that I had gotten a ticket last august, by to this day, I have yet to receive any notice in the mail. Otherwise, I would pay.
Thank you all again.

In those circumstances, you will have been charged an admin fee by the rental firm, they will have passed your details back to the police. They will take up to a year to send the actual demand for payment to you. They will probably use an outsourcing company and the bill will come in a plain envelope.

Then it is up to you to use the methods on the document to pay. There may well be a link to a photo of you driving the car.

I certainly wouldn't let that stop me going to Oslo.

You may or may not get the ticket. Italy is notorious for being very slow to send the actual tickets. And it can take up to a year. As long as you haven't gotten it yet, it means you are not delinquent.

We've also gotten reports here that some Italian authorities have started using a bill collector for those that do not pay it. So your biggest worry in not paying is getting hassled by a collection agency.

Pay the ticket if it ever makes its way to you. Meanwhile, travel with confidence.