Ditto to what Jon said. While the spring tooth harrow works in a similar fashion, in a hard packed road material or gravel, you will accelerate wear on the ground engaging parts more or less designed for top soils, which I have to believe unless its sand, are far less abrasive than road gravel.
The tool of choice for scarifying a road wear surface so that it can be re-graded would be a multi-shank ripper or scarifier to loosen up the wear surface material. These are commonly found on rear box blades which will have both the scarifiers or rippers with much thicker steel, likely with hardened wear parts to resist abrasion, and a moldboard. It is set up to contain material as you handle or grade. Ideally, you just need the rippers to scarify, and a commonly available open (no sides like a box blade) rear scraper type blade that you can angle and tilt; to grade, windrow material, cast to one side to make a crown in the center, or pull up material from the sides that may get pushed there over time.
This post was edited by Billy NY at 06:03:44 07/14/15.
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