I have done various racing games in the past (no parking games though, but they are similar). I would use proven technologies used in other games to deliver a simple but reliable, easy to control application, with some assets and make it easily extendable for adding new tracks, cars in the future for updates. I will also expose the project to be able to handle ads, leaderboards, achievments.
Please note that additional charges may apply, depending on what 3D models you want. I will make the initial project with free 3d models, and recommend paid ones to use as a replacement.