At the dealership they told us that it wasn't obligatory to display the CH sticker. Personally I think they're damn ugly... but if it's the law I'd better get some magnets for when we're in France, Germany or Italy.
I remember a similar thing in France too near the Calais border crossing.
The French sometimes target foreign vehicles to ensure they are carrying varied specific items you need in your car or something. I remember my Dad was warned and advised about it by a few people prior to meeting me there when I took the dog back to the UK.
He had to have a high visibility jacket, a dog seat belt (tho never used it), hard hats, a light, a first aid kit, cones, and various other bits from what I recall.
If you don't have it, they can apparently fine you, so at times just hang around the port.
German border police have been fining Polish tourists for not having a first aid kit according to DIN 13164 standard. In retaliation, Polish fined Germans for not having a fire extinguisher with an up to date certification. Both legally required in respective countries.
Pretty sure there's something what the Swiss can find against Italians.
Ha ..... there was a thread a short while ago (can't be bothered to search), about someone asking where to place their CH sticker, because they didn't want to mess up the appearance of the car or risk the paintwork.
And there was a popular consensus about not needing one, with a 'I've driven here, there and everywhere without one, and never had a problem, blah, blah, blah ......'
So now we know - which is why I have a magnetic one in the boot.
we also have been in France, Germany and Italy with no problems, I asked in the Post office for them but they don't have them.. anybody knows where to get them???
I've seen them in shops called Migros and Coop, but I don't know if you'll be able to find any in your area. In some rare cases, they've been also spotted at petrol stations.
I wonder when the carabinieri will catch onto the size issue too. Maybe some who speaks Italian could check on an Italian site, but according to the good old AA
"The distinguishing sign for vehicles travelling in International Traffic is governed by the 1949 Road Traffic Convention, annexe 4 of which stipulates the size and appearance of the sign - one to three letters in capital latin characters with a minimum height of 80mm (3.1in.) and a stroke width of 10mm (0.4in.). The letters shall be painted in black on a white background of elliptical form with the major axis horizontal."
so bad luck if you thought you could get away with a nice discrete one. Actually that's me stuffed then.