Quantifying weather impacts on traffic operations for implementation into a travel time reliability model

2016 ◽  
Vol 8 (1) ◽  
pp. 47-59 ◽  
Author(s):  
Z. Li ◽  
L. Elefteriadou ◽  
A. Kondyli
Keyword(s):  
Travel Time ◽  
Reliability Model ◽  
Travel Time Reliability ◽  
Traffic Operations ◽  
Weather Impacts

Research on Link Travel Time Reliability Model Based on Massive Expressway Toll Data

2014 ◽  
Vol 505-506 ◽  
pp. 719-726 ◽  
Author(s):  
Tao Wen ◽  
Chang Cheng Li ◽  
Chun Jiang Che ◽  
Lian De Zhong ◽  
Xin Xin
Keyword(s):  
Normal Distribution ◽  
Travel Time ◽  
Estimation Method ◽  
Model Parameters ◽  
Reliability Model ◽  
Travel Time Reliability ◽  
Time Data ◽  
Moment Estimation ◽  
Travel Time Data ◽  
Link Travel Time

Massive expressway toll data contained lots of valuable information. However, the skills of mining and analyzing toll data were limited currently. This study explored the modeling method of road network travel time reliability based on massive toll data. Firstly, this study obtained travel time data sample of each link at different months, and analyzed travel time statistical properties preliminarily. Secondly, this study used normal distribution, gamma distribution and Weibull distribution to fit travel time data sample, and different statistical indicators were involved to measure the fitting effect. Fitting results showed that normal distribution for link travel time was more rational and acceptable than the others. Thus, this study established link travel time reliability model, and proposed moment estimation method of calibrating the model parameters. In practical application, the reliability model can be used to judge traffic operating posture for expressway management department, and also can be used to forecast travel time information, to provide valuable reference on decision-making for drivers travel plan or route choice.

scholarly journals Evaluation of Ramp Metering Impacts on Travel Time Reliability and Traffic Operations through Simulation

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Mohammad K. H. Shehada ◽  
Alexandra Kondyli
Keyword(s):  
Travel Time ◽  
Kansas City ◽  
Evaluation Studies ◽  
Ramp Metering ◽  
Travel Time Reliability ◽  
Traffic Operations ◽  
Traffic Conditions ◽  
Wide Range ◽  
Traffic Performance ◽  
Better Than

Ramp metering has been found to improve traffic conditions on the freeway mainline by breaking the platoons of ramp vehicles minimizing turbulence at the merge locations. The majority of the ramp metering evaluation studies have examined traffic performance under specific demand conditions, whereas travel time reliability and variability aspects have not been adequately addressed. This paper focuses on evaluating two well-known ramp metering algorithms in terms of travel time reliability as well as other performance measures such as queue lengths, throughput, and congestion duration, looking at a wide range of traffic demands throughout a calendar year. The evaluation was done through simulating an 8-mile corridor in Kansas City, KS. The results showed localized improvements due to ramp metering at the northern section of the facility, in terms of travel time reliability, throughput, and congestion duration. It was also shown that ramp metering may cause a new (possibly “hidden”) bottleneck to occur downstream, thus diluting its overall benefits when looking at an entire freeway facility. It is further noted that although ALINEA performed better than HERO on the mainline, traffic operations on the on-ramps significantly deteriorated using isolated control.

scholarly journals Development and Usage of Travel Time Reliability Model for Urban Road Network under Ice and Snowfall Conditions

1970 ◽  
Vol 24 (5) ◽  
pp. 395-403 ◽  
Author(s):  
Jun-Qiang Leng ◽  
Yu-Qin Feng ◽  
Ya-Ping Zhang ◽  
Yi He
Keyword(s):  
Travel Time ◽  
Road Network ◽  
Network Reliability ◽  
Weighted Average ◽  
Evaluation Methodology ◽  
Correction Function ◽  
Reliability Model ◽  
Travel Time Reliability ◽  
The Road ◽  
Set Up

This paper discusses the travel time reliability of road network under ice and snowfall conditions. With the introduction of correction function for the influence of ice and snowfall conditions on free travel time and capacity, the function of travel time was established. According to the limitation of the current travel time reliability, the new definition was defined on the basis of quantifying the relationship between LOS (Level of Service) and travel time reliability. The breakthrough of the traditional idea that the route travel time reliability model was set by general series system was made by considering the route as a whole unit; instead of using a paralleling system; another breakthrough was made to calculate the weighted average travel time reliability of OD (Original Destination) pair. On the basis of OD pair travel time reliability, the road network reliability model was set up. A partial road network was taken as an example to validate the effectiveness and practicality of the evaluation methodology.

Travel Time Reliability

2021 ◽  
pp. 109-121
Author(s):  
Sharmili Banik ◽  
Anil Kumar ◽  
Lelitha Vanajakshi
Keyword(s):  
Travel Time ◽  
Travel Time Reliability
Sign in / Sign up

Export Citation Format

Share Document