The incident took place yesterday when Sub Inspector Dinesh Kumar and his family were on their way to Bijnor from Meerut in a car, they said.
The driver of the car lost control over the vehicle and hit two pedestrians and then overturned, police said.
Besides the two pedestrians, four persons travelling in the car were injured in the mishap, they said.
The injured were rushed to a hospital, police said, adding their condition is stated to be stable.