Evaluation of experimental symbol signs /
prepared by State Department of Highways, Division of Highways, State of Colorado, Staff Traffic & Traffic Safety Division in cooperation with Motor Vehicle Division of the Colorado Department of Revenue.
[Denver] : Colorado State Department of Highways, 
Automobile drivers /
Automobile drivers / Survey methods /
Traffic signs > Traffic signs / Colorado.
i, 15,  p. :
ill. (some col.), charts, map ;
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