The shared use of snowmobile trails with ATV's is also a safety issue. Most snowmobiliers travelling the trails do not expect to encounter an ATV around the corner. ATV's vary in size, some are small and some are much wider than a snomo. I have encountered several big ones while sledding and they take up the whole trail. Summer, spring and fall are ATV seasons, leave the short 10-12 week period (if we are lucky) to snomo's.