This mod aims to fix those vehicles without their lights texture at night switching to the proper texture. This means, vehiclelights128 is the texture used at day and was not switching to vehiclelightson128, the texture used at night. Some of them did not even had lights, as the Brown Streak and its wagon.

This is part from a PS2 Feels update for San Andreas that I have not released yet, the progress from such update was posted here:
https://www.gtaforums.com/topic/749193-san-andreas-ps2-features-to-pc/?do=findComment&comment=1070024653

And for now, I am only releasing the vehicles. Some vehicles as bikes and trains are fixed on this mod as well, not only cars.

The list of fixed vehicles is below:
*BF-400 (bf400.dff)
*Combine Harvester (combine.dff)
*HPV-1000 (copbike.dff)
*Ranger (copcarru.dff)
*Faggio (faggio.dff)
*FCR-900 (fcr900.dff)
*Freeway (freeway.dff)
*Freight Flat (freiflat.dff)
*Freight (freight.dff)
*Kart (kart.dff)
*NRG-500 (nrg500.dff)
*PCJ-600 (pcj600.dff)
*Pizzaboy (pizzaboy.dff)
*Quadbike (quad.dff)
*Sanchez (sanchez.dff)
*Brown Streak (streak.dff)
*Brown Streak Wagon (streakc.dff)
*Tram (tram.dff)
*Wayfarer (wayfarer.dff)

As a bonus thing, it includes an ASI plugin named "Vehicle Lights Fix" (vehlightsfix.asi) created by Wesser. This plugin is optional and fixes some vehicles bugs with the lights, that can not be fixed with model editing.

Enjoy,
Mugetsuga.