About Traffic Data Collection, LLC.: Traffic Data Collection, LLC (TDC) was a full service and licensed traffic data collection firm, that applied their experience and insight to ensure successful completion of client’s projects in a timely manner and on budget. Since their inception in 1996, TDC conducted over 25,000 traffic studies in which traffic data was used as the basis for important engineering conclusions, safety audits and transportation decisions. TDC was the longest-serving data collection firm in SE Michigan, with over 26 years of traffic data collection experience. TDC utilized the most current technology combined with trained technicians to ensure every traffic study was executed to the highest quality.