A man and a woman aged in their 80s were taken to hospital with serious injuries after being hit by a car.
They were struck by a silver Ford Fiesta on Findlay Way in Bletchley, Buckinghamshire, between 10:30 and 11:00 GMT on Monday.
Investigating officer PC Barry Gregory thanked members of the public who stopped at the scene to help the injured pedestrians and the driver.
He appealed for witnesses or anyone with camera footage to contact police.
He said: "This collision occurred in an area which would normally have had many pedestrians and vehicles within it at the time."