How to hit on girls late at night?

Right now, I'm on the night shift and will be for the forseeable future. It's the only time I can meet women now and I'm usually waltzing around the area from 11 PM to about 3 AM. During this time, I do spot women walking by that I find quite attractive.

It's not a bustling time, all the streets are calm and nobody is really out. It's usually just me and the occasional car/taxi that passes by. What's the protocol for hitting on girls this late at night? It's not exactly like a bar or giant social gathering, it's just her and me in this lonely street.

Any advice? I couldn't find any guides here.

Smile and say "good evening" as they walk past. If they smile back and start talking, then you take it further.