The Tennessee Driver Improvement Program, Inc. (TDIP), a non-profit organization, in cooperation with municipal and county judicial systems, offers a four and eight-hour court referral DIP. Our DIP is designed to help participants understand the risks of driving, their own limitations, and to teach them good habits that will be reflected in future behavior behind the wheel. The four hour program is designed for persons who have received their first traffic violation. The eight-hour course is designed for more serious violators.