system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why cars are getting much heavier these days?

What makes them heavy? Different kind of steel? Extra electronics? Heavier cushions?

I know that EV batteries are heavy, so there’s that.
gpt
People want taller and heavier vehicles these days. Subcompact econocars are selling less and less, and compact SUVs are selling more and more.

Also, safety features like more elaborate crumple zones and better roof support tend to add material and weight to the vehicle.