MacArthur Maze Location Markers

[jeffe]

District 4 is adding location markers to the MacArthur Maze (I-80/I-580/I-880).  They are white letters on a blue background painted on the bridge railings.  Each ramp in the interchange has a letter prefix. The East 80 to East 80/West 580 ramp is "A".  The markers are posted every 100 feet and increase sequentially -- A1, A2, etc.

In the last few days they've started to add signs to areas where there are no concrete barriers.  These signs also have white letters on a blue background.  They remind me of a simplified version of the driver location signs used in the UK.

Along with the enhanced mile markers on Highway 17 it seems like District 4 is trying out new ways for drivers report their locations.

Does anyone know anything about this project?