A BEST bus involved in a recent accident was found to be mechanically sound after inspection by the Wadala RTO. While the exact cause is under investigation, officials suggest human error may be responsible. The driver, a 15-year BEST employee, has been arrested for negligent driving. The bus, an AC electric midi bus, was recently transferred to the Vikhroli depot. Sources indicate the driver had a period of rest before resuming driving shortly before the crash.