I know 5 or 6 given paths. Which one is fastest depends on all sorts of things. Is there traffic? Has an accident on the highway brought things to a standsti

I know 5 or 6 given paths. Which one is fastest depends on all sorts of things. Is there traffic? Has an accident on the highway brought things to a standstill? Is going North around the lake slow enough that the toll lanes are worth it? Even when I know where I'm going, it's very useful to have an accurate ETA. If I get a call, I can tell someone quite precisely when I expect to arrive.