Ouellette Avenue is the historic main commercial street in downtown Windsor. It runs north–south, perpendicular to the Detroit River, and divides the city into east and west sections. Roads that cross Ouellette Avenue include the directional components East and West after their names. Address numbers on east–west roads in Windsor increase by 100 for each block travelled away from Ouellette Avenue and address numbers on north–south roads increase by 100 for each block travelled away from the Detroit River. In areas where the river curves, some numbers on north–south roads are skipped. For consistency across the city, all address numbers on north–south roads reset at either 600, for streets west of Walker road, or 800 for those to the east, where the road crosses Wyandotte Street (which roughly parallels the Detroit River).