The incident took place last night in Sawaimadhopur district. The truck was transporting stones and it fell off the bridge, police said, adding, all the three persons, including the truck driver, were crushed under the stones.
The deceased were identified as Jalsingh (40), Nawal (35), and Pooran (18).
"They were on their way to Gangapur city from Karauli district with the stones," police said today.