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Most of the length of the highway runs in the Mauricie region very close to the Saint-Maurice River on the opposite side of which is the La Mauricie National Park (Parks Canada). Several small bridges and roads connect the park to Route 155. It is also the main ground transportation route between the Mauricie and Centre-du-Québec regions and the Saguenay–Lac-Saint-Jean.
Former A-55 southern terminus (Trois-Rivières section); former north end of R-266 concurrency; former south end of A-55 concurrency; former R-161 northern terminus[3]
