The sensor consists of magnetoresistive devices that measure magnetic field. The speed of the passing vehicle is estimated by calculating the cross-correlation between longitudinally spaced sensors.…
METHODOLOGYResearchers used an on-line survey to collect data on drivers' opinions relative to diversion route usage when dynamic message signs (DMS) show travel times that are longer than normal.…
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FINDINGSBased on estimated system impacts and projected changes in travel demand over a 20 year period benefit-to-cost ratios ranged from 1.1 to 8.2 depending on corridor design. Longer corridors…
METHODOLOGYModels were used to estimate traffic with and without the improvement and the Empirical Bayes method was used to determine if crash rates decreased after the conversion. Four-year…
Speed information from machine vision cameras was used to evaluate the effects of PTMS on the work zone traffic conditions. This involved assessing changes in the variability of the speeds and…
SURVEY FINDINGSMotorist SurveyA telephone survey was used to poll motorists and assess their reaction to the PTMS. The target survey group included drivers who passed through the I-94 work zone…
Speed information from machine vision cameras was used to evaluate the effects of PTMS on the work zone traffic conditions. This involved assessing changes in the variability of the speeds and…
FINDINGSThe following were reported in the Phase II report:Overall, freeway travel speeds decreased 5 to 10 percent between 2000 and 2001.Overall, freeway travel times increased 5 to 10 percent…
FINDINGS The number of crashes recorded for the first seven months of 2001 (interim period with reduced ramp metering capacity) was 15 percent higher that the average number of crashes measured for…
FINDINGSThe number of commuters who supported a complete shutdown declined significantly from 21 percent in 2000 to about 14 percent in 2001. This change was attributed to ramp meter control…
SIMULATION RESULTSRamp metering reduced the number of acceleration-deceleration cycles and smoothed traffic flow. Fuel savings at each ramp meter ranged from 2 to 55 percent depending on ramp…
SIMULATION RESULTSRamp metering decreased total system travel time by 6 to16 percent. Ramp metering increased average mainline speeds by 13 to 26 percentThe number of stops was relatively low on the…
FINDINGSMarket research data collection results showed a number of changes in attitudes among area travelers that occurred once meters were shut down. Most survey respondents believed that traffic…
FINDINGSResults indicated that without ramp meters there was: A net annual increase in emissions of 1,160 tons without ramp meteringA decrease in fuel consumption without ramp metering of 5.5 million…
FINDINGSResults indicated that without ramp meters there was a 9 percent reduction in freeway volume and a 14 percent reduction in peak period throughput.
FINDINGSAnalysis of the benefits and costs of the ramp metering system showed that when the costs of the entire congestion management system (including changeable message signs, traveler information…
FINDINGSResults indicated that without ramp meters there was: A 22 percent decrease in freeway travel times with meters, which more than offsets the elimination of ramp delays. Meters result in an…
METHODOLOGY:
The study methodology consisted of the following:
The regional travel demand model maintained by the Metropolitan Council was used to forecast the results on traffic operations and mode…
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In 2005, Mn/DOT completed the MnPASS Phase 1 study identifying the next set of roadways to be considered for managed lanes. That study assumed that the first MnPASS lanes would be conversions of the…
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In 2005, MnDOT completed a Phase I study that examined the conversion of high-occupancy-vehicle (HOV) lanes to high-occupancy toll (HOT) lanes on I-394 and I-35W in the Minneapolis-St. Paul area. In…
All tests evaluating user response have arrived at a uniform conclusion that travelers will act based upon information from a trusted and well understood system that provides information of value.…