Sounds about right. I'd add, I want the app that tells me in a HUD what the speed limit actually is. Maybe an audible boop if I cross the line. Help me actually try to be in conformance when I think that's helpful.
This exists in many non-Google/Apple smartphone navigation apps. HERE maps (formerly Nokia HERE maps) has it with configurable over-speed limits (in addition to its freely downloadable offline maps, with points of interest). The HUD aspect is a bit more difficult to muster at the moment.
When I was using HERE maps on windows phone previously, it would always display the current speed limit and make a noise when you exceeded the speed limit. It's a feature I miss now that I'm back in android with google maps
https://maps.here.com/