Basic Car Seat Safety

It's a little bit terrifying to me, that people take the safety of their children for granted. Lately i've noticed a lot of people buckling their children into their car seats, with the shoulder straps sliding off of their shoulders, or loose, with a fluffy winter coat on, and with the chest clip down at tummy level. (sadly, car seats are used improperly 85% of the time)
There are some very basic car seat safety rules that we all should follow. I would only recommend following these guidelines, if you DON'T want your child to be seriously injured in a car accident, or ejected from their car seat.
When in a rear facing car seat:
-A 5 point harness is preferred, keep chest clip at armpit level and NOT on the neck or tummy.
-Harness strap slots should be at or BELOW the shoulders when rear facing, and at or ABOVE the shoulders when forward facing.
-You should only be able to fit 1 finger between the collar bone and the car seat strap. If you can fit more than 1 finger it is TOO LOOSE. 
-Car seat straps should not be loosened to accomodate a winter coat, which can compress in the event of a car accident, causing the child to be ejected from their seat, or at the very least, they will flop around in the seat.Here is a link, that shows how much looser car seat straps are, when worn with a winter coat. To test your own coat you can do the same thing, put the child in the car seat with the coat, and tighten the straps. Then remove the child and coat, put them back in the seat, to see how loose the straps are. 
-Newborns and infants should have a 45 degree maximum recline.
-You Must use a tether strap to anchor a forward facing seat. If your car does not have an anchor, you must have on installed.

We always use our car seat properly. Jackson never wears a winter coat in his car seat, and we live in Canada, where it sometimes gets very cold. I warm the car up before putting him in. He wears a sweater (thin fleece ones are awesome, very warm, and not puffy at all), and mittens and a hat, we wrap him up in a warm blanket to carry him out to the car. After putting him in his seat, we tuck the blanket in around him. It might be more work, but he's worth it.