Gripd identified four travel apps they say head the list in a recent press release found at RV Daily Report. I'd say that two are particularly useful for RVers.
Weatherbug-It is the largest network of professional weather stations in the U.S. so should be an excellent source of up-to-date local travel conditions.
Waze - is a social mobile application that enables drivers to build and use real-time road intelligence. The service includes constantly-updated road maps, alerts on traffic and accidents, and data providing users with the fastest route to get to wherever they need to go. Map and traffic updates are automatically collected and generated as users drive with Waze activated, but drivers can also actively report and update other users with what's happening on the road.
You can check the other two - you might find them useful as well.
Oh, and don't forget to either have your navigator do the checking or pull over. Don't be a distracted driver!
If you have other favorite apps, please share them with us. Jaimie Hall Bruzenak