The SKT is a proprietary terminal from Road Systems
https://roadsystems.com/nchrp-350-skt/
https://roadsystems.com/mash-mskt/
https://tf13.org/Guides/endterminalGuide/index.php?action=view&endterminal=105
https://tf13.org/Guides/endterminalGuide/index.php?action=view&endterminal=106
https://tf13.org/Guides/endterminalGuide/index.php?action=view&endterminal=107
https://tf13.org/Guides/endterminalGuide/index.php?action=view&endterminal=354
https://tf13.org/Guides/endterminalGuide/index.php?action=view&endterminal=108
https://tf13.org/Guides/endterminalGuide/index.php?action=view&endterminal=178
https://tf13.org/Guides/endterminalGuide/index.php?action=view&endterminal=106