I have uploaded a possible fix for it. Its in the Submod Patches and bugfixes.rar. The light timings on the problematic lights were boosted and I hope it works for you.
They randomly spawn in by chance. I did not make unit icons and slots for them because it would make the load times worse. Instead, I will make a "change car" script in the future so you can have whatever variant you want in your playthrough.