PC Tom Clough, 38, died on the A66 in South Bank, near Middlesbrough, in the early hours of 22 August alongside his colleague PC Matthew Blades when a Volkswagon Passat collided with their marked armed police car. The five young men in the Passat also died.
PC Blades' funeral took place in Hartlepool on Wednesday with
Cleveland Police Federation chair Lauren Somerville said PC Clough's partner had said public support "brought them so much strength".
Officers had been pursuing the Passat seconds before it collided with PC Blades and PC Clough's car on the dual carriageway.
The pair had been looking for the Passat after its cloned registration plates triggered an automated number plate recognition camera, although they were not involved in the pursuit, according to the Independent Office for Police Conduct.
The Passat's occupants - Michael Robert Cahill, 23, Jakub Matusiak, 23, Theo Rae, 17, Makai Saddington, 18, and Cole Robert Worthy, 17 - also died.