Bus driver Tim McGinnis, inspects his bus before starting his route at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Bus drivers warm up their buses before beginning their routs at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Bus driver Tim McGinnis, starts his bus up at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Substitute van driver Diana Castro, left, receives keys from Leticia Hernandez, right, before starting her route at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Leticia Hernandez, organizes drivers names and routes on a white board at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Rex Fuentes adjust a mirror on a bus at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Light are turned on inside a bus at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

School buses are photographed at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Bus driver Tim McGinnis, is photographed outside of his bus at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Bus drivers warm up their buses before beginning their routs at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

School buses are photographed at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Manager Corrin Reynolds, right, is photographed inside of a bus at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

Bus driver Isabel Iorizzo, runs some test on her bus before starting her route at the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)

A school bus is photographed leaving the San Jose Unified School District bus yard in San Jose, Calif., on Thursday, Feb. 28, 2019. (Randy Vazquez/Bay Area News Group)