Vehicle owners in Kathmandu need to pass an annual emission test, but many just buy Green Stickers over the counter while some even have them home delivered. Given the number of diesel buses and ...

All good things must come to an end, and so it is with the green stickers that give plug-in hybrid drivers access to California's freeway carpool lanes with just one person in the car. A total of ...

One of the major incentives for buying a plug-in electric car in California is the coveted sticker allowing single-occupant travel in the carpool lanes on the state's crowded freeways. Now, the supply ...