A single-vehicle crash closed Simonston Boulevard on Tuesday morning.
York Region Police believe a driver crashed his car into a pole north of Steeles Avenue near Don Mills Road just after 3am.
The driver, a 20-year-old man, was taken to Sunnybrook Hospital with life-threatening injuries.
Officers are looking for witnesses. If you can help, call police 1-866-876-5423, ext. 7704, Crime Stoppers 1-800-222-TIPS, leave an anonymous tip online www.1800222tips.com, or text your tip by sending TIPYORK and your message to CRIMES (274637).