The idea is to allow "Actions" X time before reaching the destination.
e.g.
The ability to set Waze to call a smart appliance at your house X minutes before reaching your house.
In my case, I would like Waze to call my sim operated gate 30 seconds before I get to it so I won't have to dial to it and break the law.
People can use it to turn on the AC or the water heater at their smart home before reaching it.
The extra value that Waze can give is that it is aware of delays and your general whereabouts and can leverage this better than other applications.