A number of years ago there was a big hue and cry about garage door safety. There had been a number of high profiles news stories about people getting seriously hurt by their garage doors. A lot of it was exaggerated, but it led to changes in product safety standards for garage doors. This led to the introduction of safety sensors for all garage door openers. This means that if the door detects something in the way of the door closing, the door closing mechanism shuts off and disaster averted.
All in all it is a good thing. While not that many people were hurt, it’s good to know that there are fewer reasons to not buy a new garage door for your home or business.