"Unusual"? Rental car traffic violations seem to be a pretty common forum topic. Rick ought to have a FAQ on driving in Europe and he does:
https://www.ricksteves.com/travel-tips/transportation/driving-europe-tips
Steer clear of big-city centers. Don’t use a car for city sightseeing.
Park your car and use public transportation or taxis.
Cities across Europe have taken measures to discourage urban driving.
For example, to drive anywhere in downtown London or Stockholm, you’ll
pay a “congestion charge.” You’ll pay a toll to drive into Oslo and
Bergen — but because of their automated systems, you may not know it
until you get a bill two months later.
Car traffic is banned altogether in many Italian city centers,
including Rome, Naples, Florence, Pisa, Lucca, Siena, San Gimignano,
Orvieto, and Verona. Don’t drive or park anywhere you see signs
reading Zona Traffico Limitato (ZTL, often shown above a red circle).
If you do, even briefly by accident, your license plate will be
photographed, usually without your knowledge, and a hefty ticket — or
tickets, if you did it multiple times — will be waiting for you at
home. If your hotel is within a restricted area, ask your hotelier to
register your car or direct you to legal parking.king.
Assume that Big Brother is watching. In many countries, traffic is
monitored by automatic cameras that check car speed, click photos, and
send speeders tickets by mail. It’s smart to know — and follow — the
area speed limit.