AT THE END OF A LOAL FLIGHT, THE WEATHER HAD DETERIORATED SO THAT LIGHT SNOW WAS FALLING. THE AIRPLANE APPROACHED THE AIRSTRIP, AND THE PILOT NOTED THAT THE AIRSTRIP WAS COVERED WITH SNOW. INSTEAD OF LANDING ON THE AIRSTRIP, THE PILOT OPTED TO LAND ON A ROAD THAT RAN ADJACENT TO THE AIRSTRIP. DURING THE LANDING ROLL ON THE SLUSH COVERED ROAD, THE PILOT LOST DIRECTIONAL CONTROL. THE AIRPLANE VEERED OFF THE ROAD AND COLLIDED INTO A DITCH AND NOSED OVER.