A collision in North York has left a motorcyclist seriously injured, Toronto police say. Emergency crews responded to the intersection of Allard and Wilson Avenues, east of Bathurst Street, after receiving a collision call at 4:40 p.m. Police say a motorcyclist was struck by another vehicle, sending the rider, an adult male, to a trauma centre with serious but non-life-threatening injuries. The driver and passenger of the other vehicle were also transported to the hospital with non-life-threatening injuries, police say. The cause of the collision is unknown.