Solo carpool-lane access has proven to be one of the most effective tools to get California drivers to buy plug-in electric cars. But soon new drivers of plug-in hybrids in the Golden State may no ...

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 ...

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 ...