I believe that the design comes with "Invisible support blocker." It does what it says, blocks supports. Many parks use that, but there are many other ways. Some scenery objects do that also, but they are visible. You can use small items and then cove them up with bigger scenery, like trees. You can also use green paths, if you're building on grass. You can ALSO lower the ground 1 block under the support you want to block, then put in a base block, which blocks the support, and then in the end, zero-clearence using 8-cars and raise the land back up. The base block won't be visible and the support will be blocked.