March 2007, all drivers are required to purchase an emission sticker when passing through low-emission zones in several cities and municipalities. Certain "green zones" have completely disallowed entrance to vehicles with higher particle emissions ("yellow" and "red" groups). Travellers passing through these areas without the sticker are charged with a €100 fine. Hungary Vignettes are required for all vehicles on motorways and expressways. Physical toll stickers were replaced with electronic vignettes and video tolling on 1 January 2008, the only physical item the purchaser receives is a control coupon. Motorway usage entitlement is verified by roadside cameras based on license plate numbers, and drivers of vehicles up to 3.5 tonnes without a valid vignette are charged with cash fines between €50 and €200. Moldova Vignettes are obligatory for personal motor vehicles registered abroad, driving on public roads, and are available for purchase at border customs posts and offices. Foreign drivers without a valid vignette are charged with cash fines between €125 and €375. Heavier vehicles use existing tax rates, with commercial vehicle drivers paying a single-entry tax and a distance-based charge. Montenegro Ecological-tax vignettes were abolished on 31 December 2011. Driving on public roads is generally toll-free, with the exception of passing through certain tunnels and bridges. Romania With the exception of motorcycles, vignettes are required for all vehicles driving on all national roads and motorways. Physical vignettes have been replaced with electronic ones since 1 October 2010. They can be obtained at most gas stations, border crossings, or online using a credit card. Drivers without a valid vignette are fined with €100 or more. The fines are dispensed by automatic systems that scan the numberplate of the car when it exits a city. Slovakia Vignettes are obligatory for all vehicles of up to 3.5 tonnes, driving on Slovak motorways. Drivers without a valid vignette are charged with cash fines between €100 and €500. Vignettes for heavier vehicles were replaced with distance-based electronic toll collection using the remote-operated toll-box in force since 2010. Special arrangements are to be sought by the motorbike riders. From 1 January 2016 Slovak vignettes are purchased and checked electronically via eZnamka.sk without a sticker. Slovenia Vignettes are required for all vehicles of up to 3.5 tonnes, driving on Slovenian motorways as of 1 July 2008. Drivers without a valid vignette are charged with cash fines between €300 and €800. On 1.4.2018, Slovenia implemented an electronic