Think traffic’s bad today? Check out this photo from 1941, as workers going to the Convair plant at Lindbergh Field mixed with all the traffic headed north to Los Angeles. What’s missing from this picture? Interstate 5, which wiped out the parking lot but created the freeway that spans the length of California and separated local traffic from those headed somewhere else.

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As Interstate 8 was built across San Diego County’s rugged mountains in the 1960s and 1970s, the most difficult section was creating the two, crisscrossing traffic lanes up and down Mountain Springs Grade, which jumps back-and-forth across the San Diego-Imperial county line east of Jacumba.

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Explore San Diego County's backroads, beaches, mountains and deserts with Joyride Guru® and award-winning author Jack Brandais. Make them your San Diego day trip.