Please show how to build this in Alice 3.5 with detailed instruction, especially how to create categories. I'm very confused. Thank you!

 

Make a New Project in Alice where you will build a roadway for an automobile to drive on.  Zoom the camera out to help with laying out your roadway. The roadway needs to be a complete circuit such as a simple oval or circle. To make the roadway, simply place other objects like trees, boulders, and architectural elements. Next, will animate the automobile. You will need to do more beyond just letting the keyboard control an object.
Implementproximity or collision detection. You will need to make at least three different categories of objects that can be placed on or near your track. For instance, you could make a category of "road hazards", "bonus items", or even just a start and finish to your track. Make these groupings so they can easily be assigned a value in future labs in this course. Make more than one of each of the items in your group so you have at least a total of ten objects altogether. You can even include some of the objects used to define your roadway. Once these items are placed in your program, have some sort of reaction occur when they are "hit" (collision detection) or when your vehicle is close to them (proximity detection).