First, here are some shots of the signs they had on display in the shops main hallway. These are old signs made from back in the 70s and 80s. They had a silkscreen machine that could transfer graphics onto reflective material.
Yes, this sign is reflective.... a picture of a signal crew installing new signs.

Signal crews installing new sign at 2900 Main by dallassignals, on Flickr

Dallas City Limit by dallassignals, on Flickr

Cedar Crest Golf Course by dallassignals, on Flickr

Dallas Convention Center by dallassignals, on Flickr

Old style Dallas Zoo sign by dallassignals, on Flickr
Art Deco signal!

Art Deco Signal by dallassignals, on Flickr
Winko no left turn sign (from 1958) that I think is neon and a set of large bead art decos once used at the gates of Fair Park in Dallas' south east side.

NO LEFT TURN light by dallassignals, on Flickr

Dallas Zoo sign by dallassignals, on Flickr
1/3 of the signs I got from the sign shop scrap pile!

signs by dallassignals, on Flickr