I would like to widen my driveway by 5 feet. I can't widen the driveway toward my house so I would have to go out toward the property line. I have a row of beautiful arborvitae that are 40+ ft. tall that run the length of the driveway. They are approximately 10 feet from the current driveway.

If I widen the driveway to within 5 feet of the arborvitae trunks, will I risk killing these beautiful bushes? If so, is there a way to properly put in an asphalt driveway without digging down the recommended 6 inches.

Thank you for your advice.