Enhanced Night Visibility Series, Volume IX: Phase II—Characterization of Experimental Objects

Gibbons, Ronald B.; Hankey, Jonathan M.; Virginia Tech Transportation Institute

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Enhanced Night Visibility Series, Volume IX: Phase II—Characterization of Experimental Objects

2005-12-01
By Gibbons, Ronald B. ; Hankey, Jonathan M.

[PDF-716.00 KB]

English

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Creators:

Gibbons, Ronald B. ; Hankey, Jonathan M.

Gibbons, Ronald B. ; Hankey, Jonathan M. Less -
Corporate Creators:

Virginia Tech Transportation Institute
Contributors:

Andersen, Carl K.
Corporate Contributors:

United States. Federal Highway Administration. Office of Safety Research and Development ; Turner-Fairbank Highway Research Center

United States. Federal Highway Administration. Office of Safety Research and Development ; Turner-Fairbank Highway Research Center Less -
Subject/TRT Terms:

[+]

Night Visibility Night Vision Traffic Safety
Publication/ Report Number:

FHWA-HRT-04-140
Resource Type:

Tech Report
Geographical Coverage:

United States
Contracting Officer:

Andersen, Carl
Corporate Publisher:

United States. Federal Highway Administration. Office of Safety Research and Development
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.
Format:

PDF
Funding:

DTFH61-98-C-00049
Collection(s):

Federal Highway Administration
Main Document Checksum:

[+]

urn:sha256:96578698c9cfb01a2b9477262528f8fa9e7117bb7338770bbe9d87be1f5a775a
Download URL:

https://rosap.ntl.bts.gov/view/dot/38061/dot_38061_DS1.pdf
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Enhanced Night Visibility Series, Volume IX: Phase II—Characterization of Experimental Objects

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