A truck launched through a guardrail and fell nearly 60 feet from a highway overpass into a crowded San Diego park Saturday afternoon, killing at least four people police said.

Police said several others were injured at Chicano Park, where a group of about 100 people were celebrating the La Raza Run motorcycle festival, according to KNSD.

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The driver is alive but was hospitalized with critical injuries. He also was arrested and charged on suspicion of DUI.

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools