For some reason, I've been encountering a glitch where the alternate route(s) appear to have been triggered, but they aren't.
When I attempt to drive through them, I end up falling through surfaces (streets, bridges, etc.) and crashing. The animation(s) for the routes also change (almost instantaneously) as I drive up to them. It even happens when I purposefully trigger the alternate route sometimes, which is quite annoying.
What could be causing this? How do I fix this?