Intersection of North Approach Bridge and Jingyuan Road of Tong Yuan Yellow River Bridge. Tong Yuan Bridge Snack Street is located at the intersection of the North Approach Bridge of Tong Yuan Yellow River Bridge and Jingyuan Road, across the Yellow River. Lanzhou Yuantong Bridge Snack Street is the first theme street in Lanzhou that integrates food, tourism, shopping, entertainment, sports, exhibitions and performances.