Bruce D. Greenshields. 85, an authority on traffic and a former civil engineering professor at George Washington University, died Feb. 12 in Tyler, Tex. He had moved there to live with his daughter, Barbara Cushing, after suffering a stroke a year ago.

He taught at GWU from 1946 to 1956. He then joined the University of Michigan faculty and was acting director of the Transportation Institute there in his retirement in 1966.

Dr. Greenshields returned to Washington and was a traffic consultant to various federal agencies until last year.

He was born in Winfield, Kan., and grew up in Blackwell, Okla. During World War I. He served with the Army Signal Corps.

Dr. Greenshields was a graduate of the University of Oklahoma and earned a doctorate in civil engineering from the University of Michigan. Before coming here, he had taught at Marquette University, Virginia Polytechnic Institute, Denison University, the College of the City of New York, the Polytechnic Institute of Brooklyn and New York University.

He was a registered engineer in Ohio, New York, the District of Columbia and Maryland.

He had written numerous books, articles and bulletins on traffic behavior, road surfaces, highway safety and aerial photography in relation to traffic matters.

Dr. Greenshields was an honorary member of the American Institute of Traffic Engineers and received an Matson Memorial Award in 1976. He also belonged to the American Society for Engineering Education, the American Road Builders Association and the American Society of Civil Engineers.

In addition to his daughter, he is survived by a son, David, of Houston; two sisters, Pauline, of Seattle, and Jane Bohling, of Ogden, Utah; two brothers, Elco, of Arlington, and Theodore, of Norman, Okla., and five grandchildren.