A chain reaction crash on the 406 early Friday morning sent one person to hospital and another to jail on impaired driving charges.OPP are looking for a third man who ran away. It happened about 1:30am in the northbound lanes near the St. David’s ramp. The driver of a Caravan rammed into the back of a Pontiac Montana. Then the driver of a Chevy Equinox smashed into the Caravan. The Equinox driver took off. The driver of the Montana was rushed to hospital with serious injuries.Police have charged the Dodge Caravan driver with impaired driving. He’s been identified as 35-year old Patrick Sproat of St. Catharines.