Lead with the plan, not the danger
Open with what could happen to them and the shutters come down, for a reason that is not really about you: being told the world is dangerous also means being told you cannot handle it. That is the part they are rejecting, not the information.
Open with logistics and almost nobody objects. "What is the plan if the bus does not come?" is a question a fifteen-year-old will answer, and answering it does all the same work.
Run the whole thing as a series of what-ifs with no emotional content. What if your phone is dead. What if the friend you were walking with leaves early. What if you miss the last bus. You are not warning them. You are pre-deciding, so that the decision does not have to be made at eleven at night by someone tired and embarrassed.
The no-questions pickup
If you take one thing from this page, take this one. Make a standing, permanent, genuinely unconditional promise: call me from anywhere, at any hour, for any reason, and I will come and get you. No interrogation in the car. No consequences. Not that night and not the following week.
It works because the thing that actually keeps a teenager in a bad situation is almost never that they cannot see it. It is that leaving means a phone call that costs them something — being in trouble, admitting they were somewhere they said they would not be, or being lectured in front of their friends. Remove the cost and they leave early.
The promise only functions if it is airtight. One conversation on the way home about what they were thinking and you have withdrawn it permanently, whatever you say afterwards. If there is something to discuss, it can happen days later, in a different conversation, framed differently.

A code word, agreed once
Sometimes they cannot say "come and get me" because of who is standing next to them. A short agreed phrase in a text or a call solves this — something ordinary enough to say out loud and specific enough to be unmistakable.
Ours-shaped examples: asking how a pet that does not exist is doing, or asking you to check whether they left something at home. What it is matters far less than that it was agreed in advance and that everybody knows what happens next, which is that you say "sure, I will check" and then you leave to go and get them.
Location sharing without surveillance
Location sharing is worth having and it is worth setting up carefully, because a teenager who feels tracked will find a way to be untrackable, and then you have less than you started with.
Two things make it acceptable. Make it mutual — they can see you too, and that changes the whole character of it from monitoring to logistics. And do not use it. Not to check where they are on a Friday, not to confirm a story, not once. The moment it becomes evidence it stops being infrastructure.
Say what it is for out loud: it means that if something happens, nobody wastes an hour working out where to start looking.
The three habits worth actually teaching
Everything else is refinement. These three carry most of the value and none of them sound like a safety lecture.
Head up, phone away
Walking while reading a screen removes almost all of your early warning and advertises that it is gone. This is a hard sell and worth making anyway; the version that lands is "you can look at it when you get there", not a speech about awareness.
Keys before the walk
In their hand before they leave the bus stop, not searched for at the door. It costs nothing and it removes the most distracted thirty seconds of the trip.
Go public, not home
If something feels wrong, walk into somewhere open and lit — a store, a gas station, a fast food place — rather than pressing on toward the front door. Home is where a follower learns where you live.
The last stretch, which is the whole problem
Groups disperse. Four of them get off the bus together, and by the final two hundred yards there is one, on the least busy part of the route, at the point in the evening when everyone is most tired.
That stretch deserves its own plan, and it is the one to talk about specifically rather than the journey in general. Which way do they come? Is any of it unlit? Is there a version that adds four minutes and stays on the main road? Fifteen-year-olds will take the four minutes if it was their idea, which is a good reason to ask rather than tell.
What to give them to carry
The same test that applies to you applies to them, only harder — legal, unremarkable, and already part of what they put on. A teenager will not carry anything that makes them look like they are expecting trouble, and being seen to expect trouble carries a real social cost at that age which adults consistently underestimate.
So: a charged phone, which is the whole reason to have a power bank in a school bag. Something loud on the keys. And whatever they were already wearing.
Rules about what anyone can carry differ by state and by city, and schools have their own policies that are usually stricter than the law. Check both before deciding anything.

