United States Department of Transportation
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Space Management: An Application of Dynamic Lane Assignment
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1993-02-01
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[PDF-54.20 MB]
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Edition:Interim - September 1989 - December 1992
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Abstract:This report presents the findings of the research conducted in the Highway Planning and Research (HPR) Project 1232- Task 5.1, Dynamic Lane Assignment Systems, sponsored by the Texas Department of Transportation. Dynamic lane assignment could be accomplished with fiberoptic technology, by electronically selecting one of the different lane use assignment displays. The research under this project was done in three phases. The first phase involved testing the sign for legibility, target value, and other human factors measures as they are affected by sign design features, and operational parameters such as sign brightness, light output, operating voltage, and sign placement relative to traffic signals. The results of the first phase aided in developing second generation signs. These signs were used to study the operational aspects of fiberoptic signs. These studies showed that motorists do not have difficulty understanding the displays and changes in the displays and that the preferable time to change the display is approximately 2 seconds after the beginning of red in the traffic signal. The signs were then installed at the intersection of the Ill 10 frontage road and Voss/Bingle in Houston, Texas, to study the effectiveness of the system. These studies revealed that the DALAS system is capable of redistributing vehicles uniformly over different lanes. This resulted in significant reduction of delays and queue lengths. Hence, DALAS has a high potential of being an effective advanced traffic management system tool.
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