Two serving police officers in a marked car and five members of the public travelling in the other vehicle died in the A66 collision.
Seven people, including two police officers, have died in a crash on the A66 near Middlesbrough following a pursuit in the early hours of Saturday.
A Volkswagen Passat was travelling the wrong way down the A66 and collided with a police vehicle on the same road going in the right direction, Cleveland Police said.
Two serving police officers in the marked vehicle and five members of the public travelling in the Passat were pronounced dead at the scene after the crash at 3.39am on Saturday.
The families of those identified have been informed and are being offered specialist support, police said.
