Route 15 is 79 kilometres (49 mi) long and is in the southeastern corner of the province of New Brunswick. Starting at the north end of the Petitcodiac River Causeway, it loops around the city of Moncton on Wheeler Boulevard, then turns northeast from Dieppe to Shediac. From there, it turns east and bypasses Cap-Pelé crossing the , then southeast to meet the Trans-Canada Highway at Port Elgin. The highway is a divided freeway from Moncton to just east of Shediac, where it remains a controlled-access highway until east of Cap-Pele.