What are these T's on the topo map?

[gsxraddict]

I've never seen this before, they go on for miles.

 

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[Slingshot]

I believe those indicate telephone lines.

 

[clv]

https://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdf

link to key for topo maps, your "T" is not listed as a symbol, but stands for power line, and that road is a light duty.

 

[lc12]

https://pubs.usgs.gov/gip/TopographicMapSymbols/topomapsymbols.pdf

link to key for topo maps, your "T" is not listed as a symbol, but stands for power line, and that road is a light duty.

Yep. Transmission line.