This perplexes me, the East Los Angeles Interchange was lit almost entirely by MV until about 2017! There were many shaded M-1000 lanterns surviving into the mid 2010s, and fco MV M-400a, 325, MSCL and MDCL lanterns spread throughout! There even appeared to be NEW MV installations into the early 2010s, with GE MSCLs with blue NEMA tags! Does anyone have any clue as to why it was this way?