How do I get car AI to stop

I'm using pathfinding to have cars move along roads and I'm trying to figure out how I can get cars to stop when another car is too close in front of them and start moving again when there's room. Right now I'm trying to use line of sight but I can't get it to work properly

I've managed to get it to work by using colliders in front of the cars that detect whether or not the car has something in front of it but I feel like there's another simpler way

using line of sight set pathfinding disabled if within range and enable when out of range.

I tried that but it didn't work, it seemed to break everything like that cars wouldn't stop unless something was behind them and they wouldn't start moving again

How many cars? for each?

did you add pathfinding on out of sight find path and move along path?

My code said

When car has LOS to car: Car stop

When car doesn't have LOS to car: Car move along path

that was it but for some reason it didn't work, maybe the cars were detecting themselves as well? I dunno but the way I worked it out seems to work fairly well too so for now I'll just stick with it while I work other bugs out of my game