Safety barriers are to go up along a stretch of road near the River Nene after two fatal road crashes in a month.
They will be put up on North Bank, Whittlesey, following the deaths of Keith Pettitt, of Deene Thorpe near Corby and Hannah Yates.
Mr Pettitt, 50, was found in a Skoda Octavia which was pulled from the river on Monday, December 2.
Police believe the car could have been in the water since November 26.
Campaigners have been asking for safety barriers to be installed.
Simon Machen, director of growth and regeneration at Peterborough City Council, said: “Our ground condition tests have confirmed that we can install barriers along the bend in the road and we are now working to install a scheme as soon as possible.
“The barrier will be around 250 metres long and will cost in the region of £50,000.
“This will be a standard safety barrier used on roads across the UK.”