How old should kids be left alone at bus stops?

Defiance, Ohio
October 14, 2009 2:00pm CST
Lately it seems several kids have been hit at or near bus stops. Some kids were crossing the street, others were getting on the bus and vehicles not stopping. Whatever the case, it is never a good out come. Recently an 8yr old boy darted out in the street at a bus stop in my area. He was hit. Taken to hospital where he later died. Where was his parents? That was never said in the local paper. How old do you think a child should be before they are allowed to be at a bus stop with out an adult? Should a young child be dropped off at a bus stop if other kids or parents are there?