The purpose of this survey was to review and critique the state of the art of nonservice facility signing. It is hoped that this information will be of assistance to traffic engineers in developing the written warrants needed. The survey was geared for obtaining information on the warrants used by the 50 states for nonservice facility signing on expressways and freeways. The tables presented represent returns from 49 of the states. The survey was sent out to the states in November 1975. The responses were received between January and April 1976 and reflect the state of the art at that time. As far as possible, warrants should be composed of specific criteria. Most of the warrants summarized in this survey are of a quantitative or specific construction, yet vague, undefinable phrases are also used. Vague warrants offer little assistance in distinguishing borderline cases and leave the application of the warrant open to criticism. In developing warrants, the major items of concern should be location relative to the highway, level of activity, size and capacity, and population of the surrounding area. The AASHTO chart concisely combines these four groups into clear, quantitative warrants. Warrants of a similar form but tailored to the needs of the states might be considered for use. The other groups, with the possible exception of availability, appear to be extraneous and do not pinpoint generators whose signing would promote efficient highway travel. It may also be important for any written warrant to contain an escape clause--i.e., a statement that can be used to deny signing for an otherwise eligible facility. However, the reasons for invoking this clause would have to be clear and reasonable and show that placement of a particular sign would have a negative effect on the promotion of safe and efficient highway travel. /Author/

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 13-16
  • Monograph Title: Traffic control devices, visibility and geometrics
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00196632
  • Record Type: Publication
  • ISBN: 0309028264
  • Files: TRIS, TRB
  • Created Date: Sep 15 1979 12:00AM