the "drift dimension"
where everybody are dino's, and everybody drifts, (it's impossible to drive straight)
is reached when you're drifting, and you go into overdrift
Blake: "I watched my brother die!"
Gramps: "They never found the body! He took the ultimate drift, into another dimension!" (the d-dimension)
Blake:"But this whole thing seems to be detailing some sort of prophecy - when one will be able to walk between the two dimensions, between the dinos, and the drift."