Most animals have evolved with the car, seeing it as a predator, albeit one that is very territorial, hunting only on its own territory, the road, and ignoring potential prey alongside. Animals know they are safe on the grass, and crows on the motorway hop across the line to the hard shoulder to let vehicles pass.
Many animals are attracted to the grass beside roads, as the salt makes the grass taste different.
Pheasants are not indigenous, having been brought from Mauritius, where they had no natural predators. Then, kept in captivity, they were safe, being released only just before being 'hunted' for sport. The few that got away, and their descendents, are the ones we see wild, who still have centuries old brains, not expecting predators. In captivity, the farmer arrives to feed them in a vehicle, so they associate vehicles with food. That is why they are likely to step out in front of us, when other animals will step away.