The following is a cut and Paste from the Ministry of Forests Guide to ATV Use on FSR's

ABOUT USING SNOWMOBILES AND
AT'VS ON FOREST SERVICE ROADS
No matter where you use your all-terrain vehicle (ATV) or
snowmobile, it’s likely you will be travelling on a Forest Service
road at some point.
It is important to know the rules around the use of ATVs and
snowmobiles on forest roads. An ATV may be used on a Forest
Service road at any time unless the road is posted with a sign
restricting use. An ATV operator must hold a valid driver’s
licence and carry a minimum of $200,000 third-party liability
insurance. Remember, safety helmets are mandatory when
operating two- and three-wheeled ATVs.
Snowmobiles may use a Forest Service road during winter,
provided that the road has not been snowplowed and is not fit
for travel by vehicles other than snowmobiles. Snowmobilers
using unplowed Forest Service roads should be aware that
cross-country skiers may also be using the road.