Suresh Kumar (55), his wife Rumesh (50) and their niece Diksha (22) were killed when a speeding truck hit their car. The truck driver fled the spot, but his vehicle has been seized, police said.
In another incident, a woman was crushed to death by a car outside a medical college on the Delhi-Dehradun National Highway near Begrajpur village, the police said.
Brijesh (40) was crossing the road when a car ran over her, killing her on the spot, the police added.