France: blind spot stickers required on trucks and buses
Since January 1 2021, heavy vehicles (buses and transport trucks) circulating in France must display a sign indicating the blind spots; failure to comply carries fines amounting up to €750. The requirement applies to all vehicles uweighing over 3500kg, independent of their country of origin or registration. A model of the stickers was made available by the French government. The stickers need to be placed in front (under the windshield), both sides and behind the vehicle; the complete guide is available from the French government (in French).