True, but one doesnt excuse the other. They’re both distinct problems, each in their own own right. And frequently a man will see it without intending to before he realizes what is happening (simply by inadvertently just looking ahead and seeing things in front of him).
Either way, a frum woman coming out of (or going in to) a car should never pose a tznius hazard, as unfortunately is so often the case these days in even the frummest neighborhoods.