Facing South Florida: Runaway Buses On December 5th, a Miami-Dade transit bus driver was run over and killed by her own bus. Our CBS4 News investigation revealed that county officials have known for years that they have a problem with so-called "Runaway Buses". While investigator Jim Defede was looking into Laquita Alvin's death, he learned the county failed to maintain the very warning device that would have saved her life, and they continue to send out buses without that device. Jim uncovers how Miami-Dade’s aging bus fleet could also be putting the public at risk, which leads Miami-Dade County Mayor Carlos Gimenez to launch an investigation into what’s being called “bus safety issues”. And, the chairman of the county commission’s transportation committee said he would initiate his own review of the transit department.