"You can also propagate cuttings from established plants in mid- to late summer."
https://www.gardeningknowhow.com/ornamental/groundcover/lithodora/care-of-lithodora-in-gardens.htm
i don't think "most" drivers today are looking for anything in particular, in any meaningful way, that i would recognize as being aware of what other cars are doing.
looking forward to seeing what you come up with