Traffic Planning and Design is an approximate 115-member consulting engineering firm that specializes in transportation engineering and other related environmental services. Throughout its history, TPD has remained dedicated to developing responsible and advanced transportation and environmental solutions. The company provides a variety of services that include developer services, contractor services, public agencies and expert testimony. It provides these services for a variety of needs, such as highway and structures design, construction management, transportation planning, traffic signal design, municipal services, environmental services, expert witness testimony and specialty services. Traffic Planning and Design is headquartered in Pottstown, Pa.