traffic keep stopping in the middle of road

no matter what map im on traffic keeps randomly stopping in the middle off the road , no matter how many times i click start traffic it keeps doing it , is there something i can do to stop this from happening or is this a bug

 

Some mod vehicles don't react well to traffic. Like they don't know what to do so they'll stop in the middle of the road and turn their blinkers on. Maybe try removing modded vehicles from traffic? Or maybe even put the game in safemode and try it out? To me it just sounds like you're experiencing an issue with some old outdated mod.