A serious collision in Sterling Heights this past Saturday has resulted in critical injuries for two teenagers and lesser injuries for two adults. According to ClickOnDetroit, the incident occurred at 6:36 p.m. at the intersection of 18 Mile and Pickett Ridge roads where a Mustang, containing the two 17-year-olds, collided with a RAM pickup, setting off a fire that required witnesses to intervene and rescue the car occupants.