A 5-year-old boy apparently ran into traffic around 1:35 p.m. Wednesday in the 5400 block of Kathy Way, near an elementary school.
Police said the boy suffered a broken ankle and minor face injuries and was taken to a hospital.
The preliminary investigation indicates that the vehicle involved in the accident was not speeding, police said.
Livermore police said they want to remind the community to be especially cautious driving in school areas. Parents are also encouraged to talk to their children about how they interact with traffic.
Wednesday's accident followed two similar incidents in August that also involved school-aged children, police said.