Earlier quoted context omitted.
They need to keep lane availability up to date - lanes get closed for repair or realignment sometimes and it’d suck to rear-end an 18 ton grader because you don’t have current DOT info…
My assumption would be that lane keeping would be about staying in the lines ahead of you, not knowing which lanes are available on the route. Available lanes can change in real-time due to all kinds of reasons.
My friend's 10-year-old Toyota will chirp annoyingly if you drift over a lane line but that's all it does. It doesn't have any ability to steer the car back into the center of the lane. Is that "lane keeping"?