To lay out, oversee and check the work of subordinate engineers performing moderately complex civil engineering work in the design of all types of bridges, grade crossing structures and approaches; and to design difficult and important major structures of advanced design; or, to layout, oversee and check the work of subordinate engineers performing moderately complex civil engineering work in the design of all types of roads and road structures; and to design and make improvements to major roads and related structures of advanced design; or, to perform professional engineering work involved in traffic control program; to plan, supervise and review the work of a crew engaged in traffic sign painting and installation, pavement striping and traffic signal light installation and maintenance; and to prepare reports relating to the failure of traffic devices. For proposed new or existing highways, to prepare, preliminary geometric designs, charts and graphs and preliminary reports on speed, no passing zones, parking, traffic signs, accidents, one-way streets, merging and through routes and related matters; and to conduct traffic movement studies, road improvement studies, road improvement priorities and related matters.