Ken, you don't say what size the gravel is.

The size is far more important than anything else. Large stone will tend to move, so will stones that are too small. The ideal compromise for a driveway (slow speed, little or no sharp wheel turns) is 3/8" - 5/8" crushed with as much of the smaller and fine particles and dust left in as possible.

If you already have fairly fine material, I would suggest just top dressing it. If the material on top is fairly large (3/4" or bigger) top dress it with smaller stuff. Any time you dig down in you risk unpacking it. If you have a rear blade that will offset, put it out and pull the material that pushed out to the shoulders back in too.

Once you have it back in order try putting some CaCl (Calcium Chloride) down on it, just sprinkle it like fertilizer, it will go a long way to holding it all together and keeping the dust down.

Best of luck.

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