(Sioux Falls, SD) — Two men are dead after two separate motorcycle crashes over the weekend in Sioux Falls. Officers responded to the intersection of East Arrowhead Parkway and South Veterans Parkway where a motorcycle collided with a vehicle just after 10:30 Saturday night. The driver of the other vehicle left the area before officers arrived with no word yet if authorities have been able to find them. That happened less than a day after a biker died in a collision on the 10th Street viaduct near downtown early Saturday morning. Police say the Sioux Falls man driving the motorcycle was going in the wrong lane when he crashed into a car without a helmet and died.