system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why have animals still not figured out that roads are dangerous for them?
gpt
Busy roads have only been around for a blink of an eye. It generally takes much longer than that to evolve behaviours to deal with new threats.

Additionally, another thing to consider is that perhaps simply not enough animals are killed by roads to change their behaviour. If a squirrel has a (just coming up with random numbers) 1 in 20 chance of dying from a car, and a 5 in 20 chance of dying from a fox, there will be a much higher pressure on 'fox behaviour' than 'car behaviour'. And sometimes, the kind of behaviour that helps them deal with other predators is what gets them killed on roads.