the big 30-foot-long, bright- yellow school bus would be hard to miss. >> that's probably 50 to 100 right there. >> reporter: in four months they sent citations to 6,600 motorists. >> that's a lot of violators in a very short time period. >> reporter: those citations generated almost $2 million in fines. but texas state senator don huffines would rather invest in safety features other school systems have adopted, like these fox-foot extenders that block traffic from passing buses. be we need to be focused on what actually works to prevent the accidents before they occur. >> reporter: austin school officials hoped publicizing these cameras would be a safety t ert, but in the first week of this new school year, scott, these cameras recorded another 900 drivers going past buses anat were letting kids on and k f. >> pelley: mark strassmann, thanks very much. coming up, what's causing smartphone batteries to catch fire? fire? that lax loves your body back.