i have been to the RIDOT warehouse when i was 8, but i was into signs then. They even showed me a pile of streetlights!!!!
I believe there was M-250R2, OVM, M-400R2, and OVS, but there may have been more or less. I wish i was into lights when i went there. There were poles in the back (davits to be exact) and probably new lights too, which i took no notice of. i did get a No parking sign and over 2 dozen mini signs as well as learn how they make a sign. it was a very cool sight when I was 8. i wish i could go back for the lights. The place is pretty close too! Not to bike to though. The only way to get there from my house is to go the highway. plus, there's a huge hill that'd be fun to go down on a bike, but you'll drop dead biking up it.
here's the RIDOT Maintenance Division, which i visited.