cats

Cats are smarter than you think. Sure, they won't be looking both ways before crossing the street. But they will know which streets are too dangerous to cross and they can usually hear incoming vehicles using those pointy things on top of their heads called 'ears'.

Now if you live close to a very busy street I can understand you want to keep your cat inside. However, I live in a more rural area where people drive more cautiously and it's really fine to let cats roam freely.