they most likely can't see you If you have to stop, stop on the side of a run, not in the middle Look both ways and uphill before crossing a trail, merging or starting down a hill Use skis with brakes or a snowboard with a leash to prevent runaway equipment Never ski on closed runs or out of boundaries because these areas are not monitored and there is no way to know what the snow conditions are; a rogue skier could even cause an avalanche.