Martinez told TMZ she was leaving a radio interview when she was rear-ended at a stop light. She said she was sore but uninjured.
The musician said she was more concerned about two guitars -- one in the back seat, another in the truck -- which were also unscathed in the accident.
Martinez's radio interview was to promote an benefit she was playing to support a local children's hospital. The benefit raised $122,000, TMZ reported.