Ice Cube's Tour Bus -- PULLED OVER For Speeding

If this is NWA, then the "A" stands for acceleration ... because Ice Cube's tour bus got pulled over for speeding this afternoon in Durham, North Carolina.

A rep for the Granville County Sheriff's Department wouldn't say how fast the bus was gunning it along I-85 North, but the speed limit on that road is 70 mph ... so the driver really must've been hauling ass.

But lucky for him, we're told the driver was let off with a warning -- no tickets issued -- and Ice Cube was nice enough to get out and sign autographs for a bunch of the officers.

FYI, Ice Cube's next show for his "Kings of the Mic" tour isn't until tomorrow in New Jersey ... so there's really no hurry.