There are a lot of things that I know about the other drivers that prevents your example from being faith. #1 and most important, they are fellow humans who value their lives. #2, how many cars have I passed in my life? Tens of thousands. How many of those cars have ever crossed the line and threatened my life? Zero (or very few). With this kind of observable repeat data, I can have reasonable expectations and don't have to rely on "faith".
Let's all remind ourselves of one of the main definitions of faith: "firm belief in something for which there is no proof" (Merriam-Webster).
Your knowledge of the other drivers is based on experience and self reflection (with regards to concerns for mortality) and your 'faith' in them looking out for their own interests and following rational human behavior. You also speak of trusting that line based on repeated experience over time which is much the same way religious faith is honed. I ask you sincerely can you remember your fist experience of how well you regarded this line especially when a large vehicle was plowing your way at a high rate of speed? Has your regard for this line keeping you and the other drivers on course always been as resolute as it currently is?
I am not particularly fond of that definition of faith (sounds like a liberal atheistic definition of religious faith) and would prefer "firm belief in something without requiring proof".
Again I insist that the faiths are equatable, and since I have both religious faith and faith in the yellow line performing its duties I would say I can draw a reasonable comparison, albeit one could argue it is biased.