The busing company whose driver has been charged with vehicular homicide for a school bus crash that killed five children in Chattanooga is the same company that operates the buses for Warren County Schools.Durham School Services of Warrenville, Ill., has more than 13,000 drivers and 13,000 vehicles on the road, a portion of those being in Warren County. Durham has been contracted to operate Warren County buses since 2011 and recently signed a five-year extension with our Board of Education.“I think our service has been very good,” said Director of Schools Bobby Cox. “Their safety training has been very good on our end and they’ve been very responsive when we’ve had questions or concerns.”The horrific crash in Chattanooga brought questions about the safety record of the national bus carrier.