If you have a 10 foot high by 24 inch diameter concrete light pole base, 1 inch anchor bolts sunk into it a couple feet, and 7 feet of the base below grade, what is the actual mentality behind driving a groud rod next to it and having a #6 ground wire to the pole. Is it because the connection obtained by tightening down the 4 large nuts onto the steel or aluminum light pole is not a real good connection, or that the 2 feet of anchor bolt is not deep enough into the concrete, or that concrete is not a good earth ground? I have seen specs before where a copper ground wire was to be connected to rebar in the concrete base,to cover this, is that as good as a ground rod? (and what would be the best way to connect to the rebar?)

There is an equipment ground already in the conduit, so is this local rod to dump lightning or what?