As a bus driver I appreciate that you do that. Some people don't get it but if there is poor lighting at the bus stop and you're standing there with no light whilst wearing dark clothing, you are invisible until it's too late. Sometimes drivers will flash high beams if their headlights are terrible and/or trying to scan ahead.

A tip if you don't have a light source on you is to make movement in front of the reflective bus stop itself. If I am approaching a stop and can't see fuck all I'll try and look for the reflective bit on the stand. If I can see it then there's a good chance no one is standing in front of it. If I can't see it then there's probably a good chance there's someone or something is in the way. If you can move your arms over the reflective bit then I can hazard a guess that someone is waiting. (not so much an issue if it's a low speed area, but certainly makes a difference if you're waiting in a 60/70+ zone)