Doctoral Dissertations


“This paper describes a study of advance warning signs for median crossovers on divided highways. Candidate crossover signs were identified from a literature review, survey of current State practices and discussions with FHWA personnel. Seven of these signs were selected for further testing in a laboratory study for legibility, understanding and driver preference. Sixty subjects representing a cross-section of drivers took part in the study, thirty at the Turner-Fairbanks Highway Research Center in McLean, Virginia and thirty at the University of Missouri--Rolla in Rolla, Missouri.

Two of the seven signs were word messages and five were symbolic signs. The results from both groups of subjects showed that the most appropriate word message sign would appear to be "Median Crossover". This sign was understood the best by the subjects to whom it was shown and "Crossover" was the word the majority of subjects thought best conveyed the intended meaning.

The symbolic sign found to be the best out of those tested was one showing two median noses. This did well In legibility and understanding tests and was least confused with other signs. It was also the symbolic sign most preferred by the subjects and was the simplest of the symbolic designs. Legibility of the symbolic signs was much greater than that of the word messages and this symbolic design is the sign recommended to identify median crossovers”--Abstract, page ii.


Dare, Charles

Committee Member(s)

TerKonda, Purush
Stevens, Glendon Taylor, 1927-
Fletcher, John L.
Gillett, Billy E.


Civil, Architectural and Environmental Engineering

Degree Name

Ph. D. in Civil Engineering


United States Federal Highway Administration


University of Missouri--Rolla

Publication Date

Spring 1986


xii, 165 pages

Note about bibliography

Includes bibliographic references (pages 134-142).


© 1986 Gillian Mary Worsey, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 5270

Print OCLC #