In developing countries such as India, traffic systems are characterized by a heterogeneous mix of motorized and non-motorized vehicles exhibiting diverse static and dynamic properties, compounded by a lack of lane discipline. These complexities significantly affect platoon behavior and pose challenges for effective signal coordination. This study investigates platoon dispersion at a complex four-legged intersection in Thiruvananthapuram city, India, under such heterogeneous traffic conditions. Key parameters analyzed include critical inter-arrival times, platoon size, vehicle composition, and speed variability. A linear regression model was developed to examine the relationship between travel distance and critical inter-arrival time, revealing that dispersion increases proportionally with distance from the intersection. The results provide valuable insights into traffic flow dynamics at signalized intersections in mixed traffic environments and serve as a foundation for enhancing signal design and coordination strategies. By addressing existing gaps in traffic modeling under heterogeneous conditions, this research contributes to improved urban traffic management practices aimed at enhancing operational efficiency and safety at intersections.