Why do they spray oil on the road before they place the asphalt during a road surface treatment?

The oil helps the new asphalt layer bond to the existing pavement below it. 

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1. Why can’t I throw my grass clippings in the creek?
2. Why do I need a permit to work in the creek?
3. Why do they spray oil on the road before they place the asphalt during a road surface treatment?
4. Why do I not see construction activity associated with the road surface treatment when I drive by?
5. Why does the County not maintain the culvert/ditch behind my house?