This is the 442nd most frequent Romanian word.
rutier
The Romanian word "rutier" means "road-related" or "pertaining to roads or traffic" in English.
Here, 'rutieră' is an adjective related to 'traffic' or 'road' used to describe the police department specializing in road-related activities.
Poliția rutieră a intervenit rapid la locul accidentului.
The traffic police quickly intervened at the scene of the accident.
In this sentence, 'rutier' refers to road conditions and is an adjective describing the road ('drum').
Drumul rutier este blocat din cauza alunecărilor de teren.
The road is blocked due to landslides.
'Rutiere' here is an adjective relating to traffic and describes the rules ('reguli').