To me, what drives the difference between roads is:
timestamp 1:
https://youtu.be/SECiS65jKr4?t=436
timestamp 2:
https://youtu.be/SECiS65jKr4?t=7733
timestamp 3:
https://youtu.be/6gnFDBi_XME?t=147
when you see smooth moving car lights, it tells right away whether this is a major road and adds a lot to realism.
FS2020 road lights are static light bulbs and when I look at them more and more I believe the idea was to recreate the look and feel of roads with traffic as seen from above (hence the red and white static light bulbs). The problem is that they are static, let alone as demonstrated in this discussion oversized and blurry.