The Chemin du Roy (pronounced [ʃəmẽ d͡zʏ ʁwɑ]; French for "King's Highway" or "King's Road") is a historic road along the north shore of the St. Lawrence River in Quebec. The road begins in Repentigny and extends almost 280 kilometres (170 mi) eastward towards Quebec City, its eastern terminus. Most of the Chemin du Roy today follows along the present-day Quebec Route 138. The modern expressway that replaces both Route 138 and the Chemin du Roy through most of its course is Quebec Autoroute 40.