Google Macadam: What you're describing is "tar-bound macadam" (tarmac). Rural roads in Ontario were once annually sprayed with waste oil (macadamized) to settle dust and bind the gravel. i suspect that road still looks good because the gravel/tar isn't monolithic and can flex, unlike the driveways that 'have to' be resealed.onehunglow said:I saw a road with cracks and some minor holes repaired with tar sprayed on it. Afterwards a layer of stone was applied and a roller compressed the mixture. 15 years of heavy traffic and weather and it still looks good.