"Traffic police or traffic officers, often referred to colloquially as traffic cops, are police officers who direct traffic or serve in a traffic or roads policing ...
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unit enforcing rules of the road. Traffic police include officers who patrol major roads and also police who address traffic infractions on other roads. It has been noted that:
...traffic police, who are regarded as peripheral to most police forces, participate in both authoritative intervention and symbolic justice. Perhaps alone of all the assignments, traffic police are full-service police. They are different from the rest, however, because their work is limited to a particular venue — namely, public thoroughfares — and to particular people — namely, those who operate motor vehicles. But in terms of work, traffic police are detectives as well as patrol officers." - (Wikipedia (en) 13.04.2020)