Eric Dickerson -- Calabasas is Finally Safe ... From Justin Bieber

Justin Bieber is done driving like an a-hole inside his Calabasas community ... so says neighbor and NFL Hall of Famer Eric Dickerson -- but Biebs 'aint off just yet.

Dickerson was cruising the 'Bas with his family ... and seemed relatively happy with Justin for making a change.

As you may recall, Bieber's fast driving earlier this year pissed off a ton of neighbors -- including Keyshawn Johnson who famously confronted him about it ... and Dickerson told us afterward he understood why.

The football legend doesn't give Justin a full pass though ... check out the video, you'll understand.