Gridlock is an Uncommon Fortnite Loading Screen. This cosmetic has been leaked, and the loading screen will hopefully be available to purchase in the near future! Gridlock was first added to the game in Fortnite Chapter 2 Season 7.
How-to Get the Gridlock Loading Screen
Gridlock was leaked or datamined, which means we don't know for sure how it will be released. Most cosmetics that are leaked will be released within 30 - 60 days of their discovery.