Parking tickets DONOT appear on your credit report
Unless they go unpaid, parking tickets are not reported to the credit bureaus.
If you fail to pay them, you may either get sued or be approached by a collection company that the debt was sold to. Either way, once the unpaid debt appears on your credit report – your credit score will take a hit.
Other then that, get as many tickets as you (dis)like… as long as you pay them..