High angle shot over highway overpass on Walnut Creek City in Contra Costa County, California, United States with rainbow visible in the background

high angle shot highway walnut creek city contra costa county california usa united states blue sky blue sky over bridge hills hill bay bridge car city cityscape crossroads district downtown driving driving roads exposure freeway interstate landmark landscape morning nature northern outdoor outdoors overpass regional roads route san francisco scenery street traffic trail tranportation valley viewpoint walnut walnut creek west rainbow