Constable Vikas sustained injuries in his head and left leg as he tried to stop the vehicle.
Police said the incident took place around 3.40 AM when Vikas and assistant sub-inspector Mange Ram were manning the picket at Jia Sarai.
A speeding Swift Dzire car rammed into the barricade, injuring Vikas.
A case under Section 307 (attempt to murder) of the IPC has been registered at Vasant Vihar police station and the accused driver, Ashok, has been arrested. The car has been seized, police said.
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