Four Corners Animation (Direct link)
By organizing all my files, I was able to backtrack to a previous project to use for this project. Additionally, though I didn't need it, Google Drive allows me to keep a back-up of all my files in case I need to access items remotely or the computer I use is wiped.
Using a path constraint caused the car to move along the spline from which the road was formed, meaning the car perfectly followed the road. It didn't, however, look like a car driving, though. To fix this, I simply checked the 'follow' and 'bank' checkboxes; the follow button made the car rotate accordling to the road, and the bank button made the car drift on the turns a little bit, as a normal car would.
When extending the animation to take 24 seconds, the keyframe where the car finished it's cycle stayed the same. I personally manually moved the frame, but a faster way is to use the 're-scale time' button to automatically move the final keyframe. The entirety of the change made the car simply move around the road slower.
Honestly, I don't know. However, I do know that the animation would be slightly off if NTSC was used, as it is actually technically shorter than 30 seconds. Though I don't think the deficit is large enough to invoke a visibly shorter animation. I've learned, though, that frame rate can drastically affect the speed of an animation. If you want a short-and-fast animation, you can increase the framerate, and if you want a long-and-slow animation, you can decrease it; there are plenty of other combinations too (long-and-fast, short-and-slow, not to mention intermediate and in-between determinations.).