CLASS SUMMARY   Performs responsible supervisory and specialized professional Traffic Engineering work in connection with site development, maintenance functions, parking management, access management, signal timing, design of traffic control devices, traffic control plans, and geometric design at the professional level.  Note:  Examination announcements and requisitions will specify field of activity in which vacancy exists and only those on the eligible list examined for that field will be certified.   EXAMPLES OF JOB FUNCTIONS   Develops and reviews plans, specifications and estimates for traffic signal systems, illumination, signing and striping, and traffic control.  Professionally de