They have been implemented throughout North America, the Caribbean, New Zealand and the UK. Everlast pole tags is a unique system to mark your distribution system. The system has been tested by UL® to not fade for over 40 years in any weather condition. In fact, our warrantee is that our pole tags will last as long as the utility pole itself.

https://www.techproducts.com/is/electric_distribution/everlast_numbers_1_indestructible.asp