This rate is calculated based on the assumption that Steven Ball is a beginner truck driver with limited experience. Truck drivers with less than 1 year of experience can charge lower rates, typically between $20-$40 per hour. Considering the Detroit Metropolitan Area is a major logistics hub, the rate may be slightly higher due to the demand for transportation services. However, without more information on Steven's specific skills, experience, or qualifications, a conservative estimate of $25 per hour is used.