Originally Posted by
specialgreen
People hear a bell or voice on their left, and they turn to their left to see who it is. You naturally veer to the side you're turning. This happens especially with novice bike riders or e-scooter riders, but also with older walkers, joggers, any bladers/skaters etc. I don't think there's a solution: there will always be new MUP users who are new to hearing "on your left," and they turn to the left, and step to the left, before their brain processes the words. It seems that we just have to expect this behavior.
Correction: there is no perfect solution. (For example, a red light ALWAYS means stop. But people still frequently cruise through them into the crosswalk to make a right-hand turn).
Nevertheless, you can't overwrite the law with your expectation. No matter how logical they may appear to you. A bell approach warning is required by law in many jurisdictions.