I don't know if you're deliberately not getting it or just not getting it.That's why I already said it would generate a list that the COM would use to find out why. They'll be able to see the actual locations so they'll be able to see if it's things like traffic lights, roadworks, etc
1. That "list" would be every duty every day.
2. The PDA data doesn't show "traffic lights, roadworks etc".
3. It's not even "traffic lights, roadworks etc" that cause the vast majority of yellow dots, it's delivery issues which change every day.
The points you're trying so hard to ignore are that.
1. Every duty produces these yellow dots so every duty would need to be sifted through every day with the help of the duty holder because no computer can tell you why the yellow dot was created.
2. In the vast majority of cases this daily and incredibly time consuming deep dive is not going to achieve anything when the postie turns round and says it's because Mrs Miggins couldn't find her front door key.
2. No one has the f***ing time for that s**t on a daily basis
This isn't bullshit SP, it's just facts anyone working on delivery would know.