California State Route 259 is a very short freeway connector that connects Interstate 215 (California) with California State Highway 210 (former CA-30) in San Bernadino County, California. It functions as the 210 WB-215 SB ramp and the 215 NB-210 EB ramp in the 210/215 interchange. This short freeway has one exit (Highland Avenue) and is not signed. It is one mile long or less. Interstate 215 in California is a 54. ... California State Highway 210, also known as the Foothill Freeway, is a route that runs roughly East-West from Sylmar in the West to San Bernardino in the East. ... San Bernardino County is the largest county in the United States by area, containing more land than 9 states. ...