The incident took place on Naubasta bypass here when the woman had boarded the truck which offered to drive her to Bhognipur. Soon, three men joined the driver and took turns to rape her.
The woman lost consciousness and was later thrown out on the street while the accused fled from the spot, police said.
The woman was found lying on the road when onlookers informed the police and the victim was taken to a hospital, they said.
The woman has been sent for medical examination and further investigations are on, they said.