IPA: //ˈkærɪdʒweɪ//
KK: /ˈkærɪdʒweɪ/
The section of a road that is used by vehicles to travel.
The carriageway was busy with cars and trucks during rush hour.
Carriageway is formed from "carriage" (from Old French *cariage*, meaning a vehicle or the act of carrying) and "way" (from Old English *weg*, meaning a path or road). The word refers to a road or path designed for vehicles to travel on.
Think of a 'vehicle' ('carriage') traveling on a 'path' ('way') — that's what a carriageway is, a road for vehicles.
No commonly confused words.