The Kamov Ka-26 is a Soviet light utility helicopter with co-axial rotors. The Ka-26 entered production in 1966. 850 have been built.They were used in various sectors of economy but some people associate them with the Soviet traffic police. Yes, orange and blue Kamov helicopters used to patrol Soviet roads.
Today it's a luck to see a Ka-26 in the air, Mi-2 helicopters are far more frequently seen.