Thanks to a quick-acting bus driver, four students at Decatur’s Carson Elementary are safe today after a bridge collapsed under their school bus and left it perched perilously above fast-moving waters. “A wonderful job,” is what Decatur Superintendent Rod Townsend said of Debby Brady. “She did her job just exactly like it’s supposed to be done. She didn’t panic and did a really nice job.” The accident happened around 4 p.m. Thursday on Heritage Creek Drive about a mile north of County Road 4421. Runoff from Wednesday’s heavy rains washed out the bridge’s support structure. The roadway under the bus began to give way as Brady eased the front wheels onto the bridge. She immediately stopped the bus and had the three boys and one girl leave the bus by its front door, which is located behind the wheels. She then walked them home to their parents. No one was injured.