Dar jalon or travel by hitchhiking

I have seen some mochileros/backpackers on the road. They were trying to travel by hitchhiking.

It’s a bit unusual here, but not impossible. When we need to hitch we say “¿me da jalon?”, where jalar/halar is a verb which means to pull.

I heard this activity is illegal in some countries but I am not sure…at least here is not  illegal but it could be dangerous.