All motor vehicles in the State of California are to have one of the two stickers (either green or red) that are placed on the left fork leg, either horizontal or vertical, that have to be visible from the left. It all happened like this. The State of California came to find out the extensive appeal to off road activities. In California were made seven State Vehicle Recreation Areas (SVRA's) for bike riders that followed the idea concluding that making legal OHV recreation areas, riding activities would take place in these areas. So, official representatives decided to administer these motor vehicles. Thus came into being the California Off Highway Motor Vehicle Recreation (OHMVR) Division of California State Parks and Recreation. And now this Division is financed by the "Green Sticker" license fee that is included in the highway/road taxes that riders pay when they buy fuel that is used when driving their vehicles off of paved highways. California Air Resources Board (ARB) established enactment to limit the use of Off-Highway Vehicles (OHVs) that do not meet emission standards applicable for California OHV riding areas.
There are red and green stickers that are obligatory on all motorbike and ATV riders. Whether your bike will “wear” a red or green sticker depends on certain criteria.
Your bike will have a Green sticker that is distributed to all California model of 2002 year and older, as well those models that were previously given a red sticker, and to 2003 and newer corresponding vehicles. Green stickers are issued to for year round use at all California riding areas.
Red stickers are distributed to 2003 year model and newer that are not certified to California EPA emission standards. Having "3" or "C" in the eighth position of the vehicle identification number your vehicle will be issued a red sticker. Red stickers are issued to bikes that can use California riding areas for seasonal use only.
It happens that some vehicles do not meet emission standards applicable for California OHV riding areas and thus are restricted to use in limited areas and certain times of the year. These vehicles are issued a red sticker. All other are issued green stickers.
The California Air Resources Board in 2006, reviewed their OHV Red Sticker Riding Season Schedule in order to make the riding locations easier to identify and to change the riding season dates.