Well stoplights do go out, but guess what? They have a fail safe that goes to a 4 way flashing, it's not possible for them to show green in contradictory directions. 40,000 people die every year in traffic accidents. If we cut that number we are safer. Is your demand that it be 100% foolproof? Because we aren't getting close to that with human drivers. If it still sometimes fails, but cuts that 40,000 to 4,000, is that not a huge advancement in safety? Humans are terrible drivers, the numbers don't lie, and are frankly embarrassing. And you can be the safest driver on the road, and it's not going to matter if some moron crosses the centerline at the exact moment that you can't avoid them.