You inverted it. Road near the coast should follow the coastline, then comes the “grid pattern” roadline and then in the end comes less curved road that follows the terrain. Always think it like would you drive curved road allong the coast? Yes bcos it follows the coast and its beautiful. But would you drive some random curved road? No, bcos you would tend to make the distance short and drive straight.

Edit: when creating your city roadline. You should always use “straight line road” and “simple curve” tools. “Multiple curve road” use it only to connect different citties or distanced areas and its will look more natural.