Of course we follow the rules, which by the way, are the bare minimun for safety. They need to do away with ages actually, and go by height and weight requirements as around here we have parents take their kids out of boosters at age 8, yet they are way under the requirements. Around here we also have 4 year olds in backless boosters. Our DD was in a harnessed seat until about 6.5, and our son will probably be in his harness past that, and in a booster until he meets the requirements.
I don't really get why you can't imagine your son in a booster seat in grade 4. What in the world does age have to do with safety?
Some adults should be in booster seats, and that is why you see very short people sitting on pillows. Seat belts are made for grown adult males, and so boosters are necessary to ensure safety.
Our daughter is going into grade 4, and we had to remove her booster just last week, as she turned 9, as she is very tall for her age. She was at the point where her ears were at the top, so no more seat for her. So despite the fact that she was way under for weight, so maxed out the height requirement. She was actually upset about it too! She sat in a Britax Frontier, as does her little brother. Very safe!
I could care less about ages and what people think, and I don't really get the thing about it being embarassing either. None of my daughter's friends are in my car, so not sure how it's relevant what goes on in my car?
This is a really hot topic for me, as I see so much lazy parenting when it comes to car seats. Parents seem to put more time and effort into buying a car, and showing off that car, then in ensuring their kids are safe in said car.
Tiger