The course is presented in the form of lectures by the instructor, reports by the students, supplementary reading, and, whenever practicable, field studies and analyses of actual traffic problems. The subjects covered are as follows: purposes of traffic control; accident statistics; accident records as a basis for accident prevention with special attention being paid to the use of spot maps, flow diagrams and collision diagrams in analysing traffic problems; legislation and administration as a means of regulating traffic; examination of applicants for drivers’ licenses; through and stop streets; critical approach speeds; traffic control at intersections by traffic beacons, traffic officers and traffic signals; studies of rotary and channellized intersections; highway and railway grade crossing elimination; traffic lanes, centerline markings; highway lighting; parking; education of all groups from the pre-school child to the adult; law enforcement, especially studying the problem of the drinking driver and the “accident repeater”; and traffic courts and violations bureaus. Reference Material: This is composed of all available literature in the field of traffic control. A few of the organizations and institutions whose literature is used are as follows: American Association of State Highway Officials; American Automobile Association; American Road Builders’ Association; Bureau of Public Roads; Institute of Traffic Engineers; International Association of Chiefs of Police; Iowa State College; Metropolitan Life Insurance Company; Motor Vehicle Department of New Jersey and numerous other states; National Bureau of Casualty and Surety Underwriters; National Conference on Street and Highway Safety; National Safety Council; New Jersey Traffic Commission; Northwestern University Traffic Safety Institute; Portland Cement Association; Travelers Insurance Company; University of Illinois; University of Michigan; and University of Wisconsin. CE 30-1 Structures. Prerequisite, First Semester Phys 30. This course forms a transition between the previous courses of mechanics (statics) and strength of materials and the course in structures CE 30-2 given to the senior civil students. It treats of a more rounded and complete study of reaction and internal stresses in roof trusses and statically determinate bridges by both analytical and graphical methods. Special emphasis is placed upon the construction and use of influence lines. A short time is devoted to the approximate solution of lateral bracing and portals. _Text: Sutherland and Bowman “Structural Theory”, 2nd Ed._ CE 30-2 Structures. Prerequisites, CE 30-1, complete course. Phys 30.