Today’s phone-based navigation systems provide a wealth of live traffic information to drivers.  However, they still require drivers to take their eyes off the road and physically look at the phone, with predictable results- many rear-end crashes.  (You’ve likely heard that taking your eyes off the road for just two seconds doubles your chance of having a collision.)
But transportation specialists in London are trying something new: displaying those live traffic updates on the backs of buses.  There are a lot of buses in London, so many drivers would have easy visual access to this information.  The hope is that drivers will no longer have to look away from the traffic scene to get this information, resulting in reduced congestion and fewer crashes.
The live traffic message boards are being tested on a number of buses for six months, and the test could be expanded throughout London, depending on the results.
More info at:
https://www.engadget.com/2016/08/10/tfl-traffic-updates-london-buses/