San Bernardino’s location at the intersection of I-10, I-15, and State Route 210 makes it a high-traffic hub for commuters, freight transport, and out-of-town travelers. That combination of heavy regional and local traffic creates consistent accident conditions across the city and county.

Interstate 15 through Cajon Pass is one of California’s most notorious stretches of highway. High speeds on I-15 in the Cajon Pass contributed to its designation as the deadliest road in California, with steep grades, high winds, fog, and heavy commercial truck traffic combining to create dangerous conditions year-round. Holiday travel periods are especially deadly, with San Bernardino County consistently recording some of the highest traffic fatality rates in the state during Thanksgiving and major holiday weekends.

State Route 138, known locally as “Blood Alley,” runs through the San Bernardino Mountains with sharp curves, narrow lanes, steep inclines, and a lack of median barriers in certain sections. Fatal crashes frequently occur when drivers misjudge turns or attempt to overtake slower vehicles on this two-lane highway.

Interstate 215 runs north-south through San Bernardino County. The stretch between Exit 44B and Exit 39 has a steep rate of collisions, particularly involving commercial trucks.

Cajon Boulevard and Highland Avenue, Tippecanoe Avenue and Hospitality Lane, and Waterman Avenue and Baseline Street are among the city’s most documented dangerous intersections, each combining high traffic volume with complex signal configurations and heavy pedestrian activity.

Interstate 10 through San Bernardino County is another consistent accident corridor, with heavy truck traffic, high speeds, and frequent merging conflicts creating daily collision risk along its length.