A Senior Traffic Engineer analyzes traffic data, plans, designs, and implements traffic control systems for roads, intersections, and transportation networks to improve safety, flow, and efficiency. Key responsibilities include leading technical design reviews, preparing project documentation like reports and plans, mentoring junior engineers, managing client relationships, and utilizing traffic modeling software such as VISSIM or SYNCHRO. They possess strong analytical and communication skills, extensive experience in the field, and the ability to work independently on complex projects.