Police say a young boy is in serious condition in hospital after he was struck by a vehicle on Prince of Wales Drive early Thursday evening.  The incident happened about 5:30.  Police say the boy was on the road when he was hit  by a vehicle just south of Hog's Back.  They are investigating whether the boy, who is under five years of age, may have darted out into traffic.  Police have spoken with the driver, but are continuing to look for witnesses to the incident, as their investigation continues.