Five snowmobile fatalities in Ontario this season has OPP warning riders to be cautious.  All of the deadly accidents happened on the roads. They want to remind snowmobilers to always travel at speeds which take into consideration their abilities, the weather and surface conditions. This is especially important during heavy snowfall and high winds when blowing snow can reduce visibility.  By avoiding closed trails, and not riding on roads, lakes, unfamiliar terrain and private property, snowmobilers can greatly reduce their risk of getting into trouble.