New Delhi: A traffic head constable was critically injured here on Tuesday when a 19-year-old youth rammed his car on him after being intercepted for speeding, police said. The incident occurred around 1.15 p.m. when Head Constable Yogendra Singh was on duty along with a traffic interceptor team to check speeding vehicles near Taj Enclave on Pusta Road in east Delhi. "Yogendra was hit when he tried to stop the over-speeding Honda City car (HR51 M 4554) driven by a teenager, who was later identified as Nikhil," a police official said. According to traffic police, the youth was driving towards Pusta Road from Shakarpur when police tried to flag him down. After hitting the policeman, the driver sped away but was intercepted by a police team. The head constable was first rushed to the Lok Nayak Jai Prakash Narayan hospital with serious head injuries and later shifted to Max Hospital. Police said the teenager was a resident of Geeta Colony.