If you make 90% the area of your city dedicated to roads leaving only 10% buildings, you can barely just get traffic under control trust me. Just like in real life.
Texas has big access roads on almost every mile of highway, and it's glorious. If there's one thing Texas does right, it's highway infrastructure. Except for its obsession with tolls.
The difference being the use of frontage roads. The entrances and exits from the main carriageway onto the frontage roads will be between this exit and the next.
I stumbled upon this civil engineer on YouTube for a different road planning game and enjoyed way more than I expected. He also has a set for Cities Skylines.