Parallel-mounted On-premise Letter Height and Sign Size

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Philip M. Garvey
M. Jennifer Klena

Abstract

Research and common sense attest to the fact that on-premise projecting signs are more detectable and are readable further away and at smaller sizes than wall-mounted signs. The objective of the current study was to conduct a small-scale field validation of earlier research on minimum letter heights for wall signs and to provide associated minimum square footage for these signs. Eight wall signs that varied in letter height and lateral offset were identified for evaluation on two roadways that varied in posted speed limit and cross-section in Nags Head, North Carolina. Using an empirical procedure involving driving and walking toward the signs, the legibility distances for these signs were evaluated and were found to compare favorably to past research that employed an analytical approach. An equation to determine sign size in square feet was also developed. Future research to further these findings is outlined.

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References

Garvey, P.M. (2006). Determination of parallel sign legibility and letter heights. United States Sign Council (USSC) Research Project, Final Report. https://usscfoundation.org/wp-content/uploads/2018/03/USSC-Parallel-Sign-Legibility-2018.pdf

United States Sign Council Foundation (USSCF). (2006). Computation equations: sign area; viewer reaction; projection control; letter height. Uni ted States Sign Council Foundation Report. https://usscfoundation.org/wp-content/uploads/2018/03/USSCF-Computation-Equations-2018.pdf

Zineddin, A.Z., Garvey, P.M., and Pietrucha, M.T. (2005). Impact of sign orientation on on-premise commercial signs. ASCE: Journal of Transportation Engineering, 131(1), 11-17. https://doi.org/10.1061/(asce)0733-947x(2005)131:1(11)