Look for the Buttons

Older-style reflectors for US 50 at South Lake Tahoe, California

Look carefully at this overhead freeway-style sign at the intersection of California route 89 and US 50 in South Lake Tahoe, and you can see the hard-to-photograph button-style reflectors in the 50 in the US 50 shield. The button-style reflectors are also used for the text in the sign. The use of such reflectors was standard California practice until 2000 or so.