Frustrated with this situation. We have 4 older teens who we encourage to be independent. We have good public transport where we live, both buses and trains, and its a generally "safe" town, with low crime rate.
Eldest son (17) has GF (18) who is ferried everywhere by her parents: college, gym, friends houses, and back home again. She is one of 2 siblings. I have no issue with what her parents do for her, that's their choice, only DH has started mirroring their behaviour and has started going out of his way to offer not only DS lifts everywhere, but his GF lifts home from ours.
It's driving me insane. They both have feet and it takes them no longer to organise making their own way between venues than it does for an adult to take them here, there, everywhere.
Both are currently taking driving lessons, GF will be given a car when she passes, so will be "independent" at that point. DS will save for his own car and expenses.