The incident occurred last night near Chevar Purav village in Devgaon area here, when one Sehdev Yadav (68), his wife Indira (60), their two sons- Chhotelal (45) and Pritvipal (38) were killed in the accident while returning from Varanasi.
The car driver, who could not be identified, is seriously injured and has been rushed to a nearby hospital.
The truck driver fled from the spot, police said adding manhunt has been launched to nab him.