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Accession Number PB2014-101762
Title Measuring the Effectiveness of Ramp Metering Strategies on I-12.
Publication Date Oct 2013
Media Count 233p
Personal Author J. Codjoe J. Rodriguez M. Russell O. Osman S. Ishak
Abstract Ramp metering is one of the successful traffic control strategies in the area of active traffic and demand management. This study evaluates the effectiveness of a fixed time ramp metering control on the day to day operation of traffic over two segments of I-12, seven miles apart, in Baton Rouge, LA. Traffic data were collected and analyzed using MIST (Management Information System for Transportation) detectors at one segment, and DCMS (Data Collection and Management Service) detectors at the other segment. The assessments undertaken include a comparative speed analysis, travel time savings analysis, level of service analysis, and speed contours analysis of the conditions before and after deployment of the ramp metering. For the MIST segment, the statistical analysis showed that for the eastbound PM peak period, 47% of the time there were significant speed increases of 7 mph, but 12% of the time there were significant speed decreases of 17 mph. For the westbound AM peak period, significant speed increase of 5 mph were observed 43% of the time while significant speed decrease of 7 mph were observed 29% of the time. The speed contours analysis supported these findings with more areas of congestion observed in the westbound AM peak period than was observed in the eastbound PM peak period. The travel time analysis showed mixed results of reduced and increased travel times depending on which weekday was being analyzed. The level of service results suggests an overall deterioration of traffic conditions for both peak periods. For the DCMS segment, however, there was an average decrease in speed from 61.91 to 58.37 mph for the eastbound PM and 53.78 to 49.06 mph for the westbound AM peak periods. The speed contours showed increased areas of congestion for both peak time periods, and analysis of travel time savings showed overall increases in travel times for both peak periods. The level of service results supported the findings, showing worsened LOS distributions for both peak periods. It should be noted, however, that the analysis for the DCMS segment did not account for the effect of the on-going construction work between ONeal Lane interchange and Walker/La. 447 interchange, which started as early as 2009. It is possible that the presence of the construction zone may have impacted the traffic conditions and obscured the benefits of ramp meters. This is because the construction work schedule overlapped with the analysis time period.
Keywords Detectors
Interstate highways
Ramp metering
Ramps
Speed control
Statistical data
Traffic control
Traffic management
Travel demand
Travel time


 
Source Agency Federal Highway Administration
NTIS Subject Category 85H - Road Transportation
91B - Transportation & Traffic Planning
43G - Transportation
Corporate Author Louisiana State Univ., Baton Rouge. Dept. of Civil and Environmental Engineering.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1407
Contract Number N/A

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