That is not current behavior on maps. For gas stations you can already add those to your current route. I am pretty sure I did that on a recent road tripHere's a specific case. I was just on a road trip and used the map screen in CarPlay to find a gas station. To get directions to the gas station, I had to cancel the directions to my final destination. It will be great to add a pit stop to get gas, coffee, etc and then have it resume my original trip after without having to re-enter it.
I just tested this…you can add gas stations in currently. As well as restaurants and a few other destinations.
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