In the first accident on the expressway, one person died and three were critically injured when their car collided with a truck, they said.
All the occupants of the car were rushed to a hospital in Greater Noida, where one of them, Hem Kumar, was declared dead.
The three other victims--Charvarti, Lekhpal and one other--are critical, police added.
The second accident on the expressway took place on in the Mathura area. Here also, a car was hit by a truck. The occupant of the car, Balli, was killed, police said.