IMO, the lack of sound for BSM is a design defect. I was making a lane change a few days ago and fully expected the BSM to warn me of the car in my blind spot. Fortunately, I always turn my head to check the blind spot, but the lack of a BSM warning sound shocked me. Without the warning sound, BSM effectively doesn't exist.
When I'm switching lanes, having to focus my eyes on the small BSM light means I need to take my eyes off the road, which is a safety problem. The BSM light is only effective is the driver remembers each time to focus on the light, and if the onus is on the driver, then having a BSM light on the dashboard has the same effect.
Having an audible warning sound is the best solution and doesn't increase the bill of materials for the car. Alternatively, the BSM warning light needs to be much more noticeable, like bright LEDs around the entire border of the side mirror.
The part I bolded was very entertaining to read.
I'm glad BSM is silent. My previous vehicle would only make an audible alert in the worst condition. It allowed the driver to drive the vehicle but if we didn't act human it would finally interact. At least I think I remember it sounding once, maybe it never did.
Auto manufacturers really need to have a standard to follow because all manufactures making a different system than another allowing drivers to stop paying attention are causing issues.
As for visibility, that's a tough one for me. I was in a car with a large orange light on the interior door panel. Very obnoxious for both the passenger and driver. This was a rental vehicle so I was a passenger and a driver. In time we lean how to ignore the values.
My vision is not the same as it was 5 years ago, yet even in the new RAV4 I see the BSM alert in the left hand mirror when I'm driving straight. Even for me it is fine, but for the auto makers come up with a solution that is good everybody is going to be tough. I can't read the info on the cluster too well, I have my trip meter current and the trip numbers are blur, yet I can see the orange BSM just fine. How do they make a system that is suitable for we with declining eye sight and good peripheral vision but also good for person without good peripheral vision? Or vision that is suffering more than mine. I'm all for an audible alert as long as they offer a menu item to turn it off. Personally, the orange is more than enough -however I look where I'm going and don't wait to be told I shouldn't be running a car off the road, therefore an audible alert for me is not required since I'm lookin at the car!
I can understand the safety factor when the BSM is difficult to find or see and should be coupled with the audible warning, however that's also saying that a person isn't checking their mirror anyway and that person should in fact be audibly warned to be a human.
I really like reading threads like these because it really shows just how different we as humans are from other humans. What works for one doesn't work for another and we need to find ways for the auto makers to make us all human.
The closest they have come so far are self driving vehicles for humans to be transported without having to do things or interact. Once that is perfected, we'll all be in great shape.