Interstates in the portal to Alanland.
It's not a portal. It's a causeway that disappears if you go above or below 85 MPH.
I thought it was 88 MPH.
85 brings you to Alanland, 88 brings you back in time, and both at the same time gives you real-life admin powers (e.g. teleportation to wherever you want, ability to kick/mute/ban people, unlimited creation of any object, etc.).