Traffic modellers develop analytical and simulation-based models that represent vehicle movements, congestion patterns, travel demand, and multimodal transport interactions. They use traffic simulation software, statistical modelling, GIS tools, and real-time mobility datasets to forecast traffic scenarios and evaluate infrastructure impacts. Their work informs road design, public transit planning, smart mobility systems, safety assessments, and policy decisions. They collaborate with civil engineers, urban planners, data analysts, and transport authorities. The rise of smart cities, autonomous vehicles, and intelligent transport systems significantly increases global demand for traffic modelling expertise.