VAEGMAERKENS LAESBARHET VID MOERKERKOERNING: EN PROBLEMANALYS OCH NAGRA RESULTAT ROERANDE EFFEKTEN AV FROSTBELAEGGNING (THE LEGIBILITY OF ROAD SIGNS DURING NIGHT DRIVING: AN ANALYSIS AND SOME RESULTS CONCERNING THE EFFECT OF FROST)
The objective of the present study was to compare the legibility of road signs with different kinds of retro-reflective sheeting under dry and frosty conditions at two levels of vehicle head-lighting. The results do not permit any general conclusions about the superiority of a certain kind of sign, but the interactions rather indicate that the best legibility is obtained by different signs under different conditions. The variation in legibility between various conditions is interpreted as effects of deviations from an optimal luminance level. With the study as a starting point an overview is then given in which various factors influencing the night-time legibility of road signs are presented. Beginning with this overview a model for an alternative method for legibility studies is discussed. Finally some of the results are discussed from traffic safety point-of-view, and the great differences between arithmetic means and 5:th percentiles are observed.
- Text in Swedish. Summary in English. Errata sheet inserted.
Swedish National Road and Transport Research Institute (VTI)Olaus Magnus vaeg 35
Linkoeping, Sweden SE-581 95
- Dahlstedt, SGR
- Publication Date: 1977
- Pagination: 41 p.
- TRT Terms: Highway transportation; Legibility; Luminance; Mathematical models; Roads; Traffic safety
- Subject Areas: Highways; Safety and Human Factors;
- Accession Number: 00328359
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: VTI-120
- Files: NTIS
- Created Date: Apr 15 1981 12:00AM