INTRODUCTION. 
The standard specifications for steel highway bridges set forth in 
this bulletin are those recommended by the subcommittee on 
bridges and structures of the American Association of State Highway 
Ofiicials. They were presented to the association at its annual meet- 
ing at Kansas City, Mo., December 4 to 7, 1922, and were subse- 
quently adopted by the association by letter ballot. They have 
since been approved by the Secretary of Agriculture for use in con- 
nection with the administration of Federal appropriations for con- 
struction of the Federal aid highway system. 
The membership of the subcommittee on bridges and structures of 
the American Association of State Highway Officials follows: 
E. F. Kelley, U. S. Bureau of Public Roads, Washington, D. C, Chairman. 
E. E. Brandow, State Highway Department, Pennsylvania, Secretary. 
J. H. Ames, State Highway Commission, Iowa. 
C. E. Andrew, Department of Public Works, Washington, 
G. F. Burch, Department of Public Works and Buildings, Illinois. 
W. L. Craven, State Highway Commission, North Carohna. 
L. N. Edwards, State Highway Commission, Maine. 
J. T. Ellison, State Highway Department, Minnesota. 
W. R. Glidden, State Highway Commission, Virginia. 
C. B. McCullough, State Highway Commission, Oregon. 
C. A. Mead, Board of Public Utility Commissioners, New Jersey. 
S. B. Slack, State Highway Department, Georgia. 
M. W. Torkelson, State Highway Commission, Wisconsin. 
H. E. Warrington, Department of Public Works, California. 
G. G. Wickline, State Highway Department, Texas. 
R. B. Wright, U. S. Bureau of Public Roads, Portland, Oreg. 
