Eli5: How come the median between highway lanes is so barren?

Question

I understand that it’s not the most hospitable environment for most plants (salt, car accidents, minimal animal traffic) but that space gets mowed to keep what grows there short. Why not have some wildflowers, native grass, or even trees there? Trees would act as an extra barrier between such fast traffic

In: 9

Answer 1

Most places have regulations about how far away trees must be from roads with high speed traffic so people don’t crash into them. You also don’t want to attract wild animals like deer close to the highway.