The city I live in is not flat, nor rectilinear, nor logically arranged. Therefore, algorithmic traffic modelling is hard, statistical models from previous data aren't reliable, and shift happens. I can visualize the way, or the map, but I only have a very general idea which route is least congested now; enter traffic crowdsourcing, and voila...oh wait, it's all congested anyway, as the other Waze users get rerouted to alternates.

To find the least congested route to home from office and vice versa.

Though I know all the roads around here (Bay Area) I still need google maps to find out which one is least congested.

That makes sense. I guess it's a mixed bag having many possible routes home