Navigation apps have mostly settled into a comfortable state of "good enough" mediocrity. In addition to the "red but no traffic" problems highlighted by others I find turn by turn directions are incredibly annoying while driving in areas I'm intimately familiar with and there's no way to say "I know what I'm doing when I'm in this area" or "pause giving me voice directions for 10 minutes". Additionally:
* I can't compare multiple modes of transportation on the same map. E.g. driving vs. walking vs. transit.
* There's no way to optimize for minimizing left turns, especially onto busy streets.
* Multi-destination route optimization is not available. E.g. I need to go to the mall, the grocery store, and the bank, what's the sequence of destinations and route that minimizes travel time.[1]
Edit:
[1] I realize this is describing the travelling salesman problem, but for small (<=4) n it should not be too difficult while still being useful in practice.
* I can't compare multiple modes of transportation on the same map. E.g. driving vs. walking vs. transit.
* There's no way to optimize for minimizing left turns, especially onto busy streets.
* Multi-destination route optimization is not available. E.g. I need to go to the mall, the grocery store, and the bank, what's the sequence of destinations and route that minimizes travel time.[1]
Edit: [1] I realize this is describing the travelling salesman problem, but for small (<=4) n it should not be too difficult while still being useful in practice.