A commercial bus crash in Virginia that killed five people and injured dozens of others has raised questions about the driver, the company that employed him and the overall safety of the industry.It’s not yet clear what could have prevented last week’s crash because the National Transportation Safety Board investigation is just beginning. Still, it highlights the inherent dangers whenever a bus or semitruck crashes into other vehicles — even if riding a bus is much safer statistically than driving a car.While collision-avoidance technology and emergency braking systems are standard on many new cars, commercial buses still lack them — even in the face of longtime NTSB recommendations and proposed regulations to require them.Observers say the circumstances of the crash that happened early Friday also raise questions about driver fatigue. Court records, meanwhile, show that the E&P Travel Inc. bus driver, who now faces manslaughter charges, was previously ticketed for excessive speeding, along with other drivers for the same company.

While those tickets might not have been enough to automatically revoke the man’s commercial driver’s license, industry experts say even one similar violation would normally get a driver fired.