Yes, asphalt can be laid over dirt. However, it is important to ensure that the soil beneath is properly compacted and leveled before laying the asphalt. If not done correctly, the pavement may settle unevenly or crack due to shifting of the underlying soil. Additionally, a layer of gravel should be added on top of the dirt before laying down asphalt for better drainage and stability. With proper preparation and installation techniques, you can have a long-lasting asphalt surface even when installed over dirt.