I immediately did SF to Reno through sacramento and south lake tahoe. Wildly different even in four hours.

A URL that persists the entered route might be desirable (especially to demo here). Otherwise I'm sure the additional features are endless.

Thanks for the feedback. When you say wildly different, was the weather different? Or did the application behave differently? I will definitely consider sticky URLs!

It behaved properly.

I pictured someone using it on a 2 week road trip. But even within a couple hours traveling in SF/bay area, it can be pretty hard to know what weather you'll encounter. Even if you're a local.