I have CB in my RV. I use it when traffic is slowed or stopped. Always good to know what lane to get in and how much of a back up is involved. Also good when I get bored listening to XM radio all day. I am not a speeder in my RV but the Bear reports are good.
My CB has weather channels and I get weather warnings on it. I do leave radio on to monitor weather reports.
Saved me a lot of time coming into Baton Rouge. Traffic was stopped as their was a big accident on the Mississippi River bridge. Truckers were telling each other to get off a exit prior and head north and cross river and then back to I-10. I listened and followed and it worked like a charm.
Yes there is room for CB and RV forums on your smart phone - but CB is still king when you need to know what is happening in your immediate area now.