Where I live, freeways and highways are the same thing, so I’m confused here.

Oh they're definitely different here.

Freeways are usually eight length cement highways with an impassable divider in the middle and no buildings on their immediate sides, just off ramps.

Highways are usually two or four lane roads that you can pull off of at any point to go to a building. They have more traffic than regular city streets, but they're not considered throughways like freeways are.

To my point I made earlier that you reply to about the confusion, I wasn't speaking so much about breaking, but just the faster you go the more tire wear and tear and hence the more tire dust you get to breathe, as well as emergency braking for sudden stops or lane changes, etc. City streets cars are usually a little more tame and mundane speedwise than they are on highways and freeways.