| Title | Enhanced Night Visibility Series, Volume IX: Phase II—Characterization of Experimental Objects |
|---|---|
| Record ID | 65690 |
| Personal Name Creator |
Gibbons, Ronald B.; Hankey, Jonathan M. |
| Personal Name Contributor |
Andersen, Carl K. |
| Corporate Creator | Virginia Tech Transportation Institute |
| Corporate Contributor |
United States. Federal Highway Administration. Office of Safety Research and Development; United States. Department of Transportation. Federal Highway Administration. Turner-Fairbank Highway Research Center |
| Publisher | United States. Federal Highway Administration. Office of Safety Research and Development |
| Publication Date | 20051201 |
| Language | English |
| Abstract | The Enhanced Night Visibility (ENV) project is a series of experiments undertaken to investigate different visual enhancement systems (VES) for the nighttime driving task. The purpose of this portion of the ENV project is to establish the photometric nature of the objects presented to the observer. The photometric measurements of interest are the headlamp illuminance, object luminance, and the background luminance. Other calculated parameters were established such as object contrast with the background, reflectance of the objects, and object visibility level. The measurements were taken and calculated for 11 VESs and 8 object types. The correlation of the measurement results to those of the ENV visual performance studies was calculated. It was found that all the calculated metrics were fairly highly correlated to the participant results. The visibility level was the least correlated, and the Weber contrast ratio was the most highly correlated. The transmittance of the atmosphere was also calculated for each of the weather conditions used in the ENV visual performance studies. The correlations calculated for these conditions showed that the Weber contrast was again the most highly correlated metric. |
| Rosap ID | dot:38061 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/38061 |
| TRT Terms | Night visibility; Night vision; Traffic safety |
| Geographical Coverage |
United States |
| Contract Number | DTFH61-98-C-00049 |
| Report Number | FHWA-HRT-04-140 |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/65000/65600/65690/FHWA-HRT-04-140.pdf |
| Format | |
| Database | NTL Digital Repository |