Here's something that really annoys me (Caution: "Grumpy Old Woman alert"): These same baby-on-board people are often to be found parked, with their road-side door wide open, either taking their child out of the rear car seat or putting the child back in. The door is often very wide, too - the vehicle generally being a 4x4.
   
Incredibly dangerous, apart from being totally inconsiderate to the traffic which is unable to pass them. WHY don't they open the door on the pavement side and lean across ? Is it that difficult ? I guess they are so selfish that they think that if they did it from the pavement side, they would actually hear the people walking on the pavement saying "Excuse me", and they would have to pull their door in to let them pass. By having the door open on the road side they can pretend to be oblivous to the delays they are causing. Or are they just oblivious to others in general ?

- jeanie