@Topray
"Have completely unrestricted and unsupervised phone access (so not even having to leave phone downstairs at nighttime)"
Yes, but he left it downstairs overnight until age 15, and if I ask to see his phone he hands it over without a fuss (unlike his older brother, who was much more secretive, but only because he had a girlfriend).
"Work part-time if still at school or college."
Yes, though "Casual", not part time. He's a casual lifeguard for a local-authority swimming pool. They send out a list shifts and he chooses them based on his availability. He only works a couple of shifts a month (more in school holidays).
"Learn to drive (either self-funded from wages or with parental help)"
Definitely! It's a right of passage! His test is coming up in April.
"Travel in a car driven by a 17-year-old"
I wouldn't be happy about this, but luckily it has never arisen. We live in London, so most places are easy to get to by public transport.
"Stay overnight at the home of a friend you do not know"
This hasn't arisen yet, but I'd be inclined to trust his judgement.
"Use public transport alone at night"
Define night! He is sporty, and we usually pick him up from evening training at 10pm, but occasionally he has got the bus.
"Regulate their own sleep, even if this means getting out of bed at 3pm on a weekend"
I would knock on the bedroom door if he wasn't up by mid-morning. He is usually awake, but often lies in bed all morning using his phone.
"Stay home alone overnight or for multiple days"
This has never arisen. I would trust him, but would worry that he might be lonely.
"Be out and about without you know really knowing exactly where they are at any given moment"
We use Life 360, so always know where he is, and he knows where we are too. It's reassuring.