Seat Belt adjusters are safe for adults as long as you have the seat belt adjuster adjusted properly so the seat belt fits properly and protects you.
If the seat belt is too loose then the seat belt cannot protect you properly.
The reason you should wear your seat belt when in a vehicle is to keep you safe and keep you from flying through the windshield or from being ejected in a crash or keep you from being tossed around in the vehicle in a roll over.
Seat Belts do save lives but some crashes are so severe that even a seat belt cannot save you but still it's a great idea to wear the seat belt.
A seat belt protects you in a crash by keeping you in your seat and preventing you from flying through the windshield or from being ejected out through another window or door should one fly open.
In the event of a roll over the seat belt also keeps you from flying around in the vehicle which can be more deadly.
Although wearing your seat belt you can still be killed in a crash but they do save you from most crashes and you should wear one.
Also children should be in a child car seat restraint to keep them safe in a car crash as well.
Seat belt is two words and not one.
Some people spell it as seatbelt which is the wrong spelling of it.
When you write or type seat belt you type it or write it as two words which is Seat Belt or Seat Belts.
A seat belt (also known as a safety belt, or spelled seatbelt) is a vehicle safety device designed to secure the driver or a passenger of a vehicle against harmful movement that may result during a collision or a sudden stop.
Although I've heard that both seatbelt and seat belt are correct spellings of the word but when you type in seatbelt the spell checker underlines it and is showing that it's the wrong spelling.
But when you spell it as seat belt the spell checker does not under line it but then it couldn't because seat is one word and belt is another word.
It's actually a belt for strapping you into a seat in a vehicle.
Seatbelt which is a noun and description of item.
Seat belt refers to a belt with an seat like leather belt or colorful belt so discusses the noun belt which has a descriptive adjective seat.
But a seatbelt is a noun describing a specific item, that is, a strap attached to your seat to be put on for safety purposes.
A seat belt is just a belt that is described as a belt used on a seat for whatever purpose such as tying the seat to another seat or tying the seat to the vehicle.
Another example is birdbrain which describes someone who is not too swift or bird brain which is the brain of a bird.
Or you can be a catspaw and used as a dupe of another or a cat's paw is the paw of a cat.