Soldato
Couple of bad habits that spring to mind for me:
- Indicating before a lane change even whens someone is approaching from behind (not at speed...but in slow moving traffic). A habit I picked up while commuting to work along a busy motorway of packed, but slow moving traffic. Following the highway code logic of not signalling until it was clear would mean I would never be able to change lanes because of the constant stream of bunched up traffic from behind. Instead, I would signal and wait for someone to flash me to signal that they were letting me out. I'm sure it's fairly common, but it's a bad habit nonetheless.
Is it, though? Indicating should always be to show your intention that you'd like to change lanes rather than the oh-so-common "I'm going to change lanes in 0.4 seconds, you'd better be ready, sucker". I do as you do in the situation you've described and I don't think it's a bad thing.