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- Canada
This is the mirror adjustment that Davidiot is talking about.
The problem is that we can't expect everyone to use this method because it isn't regulated or enforced. People will adjust their mirrors how they were taught to, or how they want to. Also, in your scenario, having mirrors set up as above, you might be able to see the guy flying up from the right-most lane, but it's a lot less likely. As you say, its best to rely on your own eyes and judgement as the BSM wouldn't be able to alert you in that situation.
Anyway, steering back toward the original topic, hopefully GAXIBM understands the difference between the two systems and how they work. To determine if the system is working correctly, they can visit a dealership and test drive a similar vehicle to see if the "problem" persists on the test vehicle or request a technician ride-along to ensure it is working as designed.
The problem is that we can't expect everyone to use this method because it isn't regulated or enforced. People will adjust their mirrors how they were taught to, or how they want to. Also, in your scenario, having mirrors set up as above, you might be able to see the guy flying up from the right-most lane, but it's a lot less likely. As you say, its best to rely on your own eyes and judgement as the BSM wouldn't be able to alert you in that situation.
Anyway, steering back toward the original topic, hopefully GAXIBM understands the difference between the two systems and how they work. To determine if the system is working correctly, they can visit a dealership and test drive a similar vehicle to see if the "problem" persists on the test vehicle or request a technician ride-along to ensure it is working as designed.