EXCLUSIVE

The Dave Matthews Band's "Fire Dancer" bumper sticker is like the Bat-Signal for Dave when he's looking for a spot to booze -- and one lucky fan came to his rescue in Atlanta.

Matthews pulled over a DMB fan stopped in standstill traffic near his hotel on Monday. Apparently, he spotted the band’s signature sticker on her SUV.

The unsuspecting superfan says she heard a tap on the window, looked left and screamed ... "Holy s**t!! Dave Matthews' face is in my car window!" She immediately pulled over, 'cause y'know ... it was FREAKIN' DAVE!

She asked for a pic, Dave obliged ... and then the “Crash” singer asked her for a favor -- point me to a decent watering hole. She sent him to a joint called Article 14.