The Yuba City bus disaster occurs in Martinez, California. Twenty-nine are killed making it the deadliest road accident in U.S. history.

The Yuba City bus disaster occurred on May 21, 1976 in Martinez, California. A chartered school bus transporting 52 passengers on an elevated offramp left the roadway, landing on its roof. Of the 52 passengers (not including the driver), 28 students and an adult adviser were killed in the crash.As of 2019, the incident remains the second-worst bus disaster in U.S. history and the deadliest to involve a school bus (in any usage). It also remains the deadliest highway disaster ever investigated by the National Transportation Safety Board (NTSB) since its creation.