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Yes, you can screw directly into concrete, but only if you use screws specifically made for masonry or concrete. They're often labeled as masonry screws and made of steel and a special thread that provides a strong grip. However, even when using these screws, drilling a pilot hole first will make it much easier. 

No, you cannot drive on concrete after three days because it has not cured enough to support the weight of a vehicle. Doing so will likely leave tire track imprints on the concrete surface and reduce its long-term strength. It is best to wait at least seven days before driving on concrete.

If you don’t put gravel under concrete, the concrete can crack, sink, bow, or crumble. Even the concrete forming process will not go as smoothly if you are working directly on the soil or bare bedrock. The lack of a proper gravel layer can also lead to drainage issues below your slab, leading to water issues throughout your lawn and around your foundation.

The average cost of concrete by cubic yard is about $130 , falling in a range of $110 to $150 . If you’re looking to pour concrete over a smaller area, you may be able to pay per cubic foot of concrete, which would make the overall cost less expensive. It’s also possible to pay for a truckload of concrete, if your project calls for it.