I wish my car had a drone for instant scouting of traffic-jam alternates.
You do, it's called the Waze user that is ten minutes ahead of you down the road, mixed with many road sensors reporting traffic flow rates.
If you are using navigation many mapping applications automatically route around traffic issues (including Waze). I personally just have it up while driving, not really using navigation but just to keep an eye on traffic rates and issues. I've turned off many a highway before to avoid a Waze reported issue and taken a pretty obvious alternate route you could see at a glance on the map.
For anyone that has not tried leaving modern mapping applications open with traffic status enabled, I highly recommend it - just get a decent car mount so it's easy to see the display. I recommend Waze in particular only because it's one of the best at taking in user reports as to police or road hazards (like chair in right lane! just one example of something I have reported in the past).