Theoretically, any properly trained and fully awake driver has no need for blind-spot monitoring, because they turn their heads and look at the lane beside them when changing lanes, but fortunately car companies know that not all drivers are properly trained.
Blind spot detection
What is Blind Spot Monitoring or BSM? – BabyDrive
What Is: Blind-Spot Monitoring
Blind Spot Monitoring System – Know More about It
What Is Blind-Spot Monitoring and Do You Need It? - TrueCar Blog
BY-J Car Blind Spot Detection System, 24GHz Millimeter
Aftermarket Blind Spot Detection Can Save Your Life - Motors Blog
Is Blind-Spot Monitoring Worth It? What Is It Exactly?
How To Get A Blind-Spot Monitoring System For Free
Blind spot monitor - Wikipedia
Blind Spot Monitoring 101
Blind spot monitoring: what is it?
Aftermarket Blind Spot Monitor