Roads are easy. They would be 3D. A road then looks like a rod, possibly curved. Roads connect together like a jungle gym (dating myself: they went out of style long ago) or a tangle of wires.
One could build a computer game with 3D roads, as follows. The up-down dimension is of less interest, so use that steering in the extra dimension. To the driver a road then usually looks like a circle, with the 3D perspective view going off into the distance aligned with the vehicle. The game is to stay in the circle, not exceeding friction due to excess speed in the turns.
Scenery -- trees, buildings, streams, etc. -- would completely surround the road with the sky not visible. The 4th up-down dimension could be encoded via topographic lines and/or colors, if desired.
All this can be extended to arbitrary travel, without a road. Maps would also work like this.
The equivalent of an automobile would have 8 wheels for stability (I think.), two sets perpendicular to one another. A motorcycle or bicycle would have three, I think, two steering perpendicular in front and one in the rear. But I'm not sure about that.
What would the steering wheel look like, if any? Two wheels perpendicular to one another? That could work.
The equivalent of a child's tricycle would have how many wheels? My best guess is 5, three for stability and two for steering.
Trees would look roughly the same, since one would expect circular symmetry in the extra dimension. More room for branches, though.