scholarly journals Evaluation of alternative Ramp Metering scenarios on freeway on-ramp with the use of microscopic simulation software Vissim

2020 ◽  
Vol 45 ◽  
pp. 483-490
Author(s):  
Danae-Zoe Mitkas ◽  
Ioannis Politis
Keyword(s):  
Simulation Software ◽  
Ramp Metering ◽  
Microscopic Simulation

Development of a Microscopic Simulation Based Performance Evaluation Model to Compare Operational Improvements with Capacity Additions

2014 ◽  
Vol 668-669 ◽  
pp. 1476-1479
Author(s):  
Tang Tang ◽  
Da Zhi Sun ◽  
Vipinshankar Govindankutty
Keyword(s):  
Performance Evaluation ◽  
Evaluation Model ◽  
Capacity Expansion ◽  
Simulation Software ◽  
Ramp Metering ◽  
Microscopic Simulation ◽  
Performance Evaluation Model ◽  
Simulation Based ◽  
Operational Improvement ◽  
Expansion Strategies

The objective of this study is to develop a microscopic simulation model to objectively compare operational improvements with capacity expansions. Simulation software VISSIM was used to redesign the existing facilities for the performance evaluation of operational improvement and capacity expansion strategies from delay time, emission and fuel consumption perspective. Two case studies were performed with different test beds to evaluate the effectiveness of performance evaluation model, majorly involving dynamic speed, ramp metering and hard shoulder usage strategies which are discussed in detail to illustrate the changes due to operational improvement and capacity expansion strategies.

scholarly journals An Integrated Variable Speed Limit and ALINEA Ramp Metering Model in the Presence of High Bus Volume

2019 ◽  
Vol 11 (22) ◽  
pp. 6326 ◽  
Author(s):  
Dadashzadeh ◽  
Ergun
Keyword(s):  
Management Strategies ◽  
Congestion Management ◽  
Simulation Software ◽  
Urban Transport ◽  
Ramp Metering ◽  
Mixed Traffic ◽  
Variable Speed ◽  
Microscopic Simulation ◽  
Proposed Model ◽  
Total Travel Time

Under many circumstances, when providing full bus priority methods, urban transport officials have to operate buses in mixed traffic based on their road network limitations. In the case of Istanbul's Metrobus lane, for instance, when the route comes to the pre-designed Bosphorus Bridge, it has no choice but to merge with highway mixed traffic until it gets to the other side. Much has been written on the relative success of implementing Ramp Metering (RM), for example ALINEA (‘Asservissement line´ aire d’entre´ e autoroutie’) and Variable Speed Limits (VSL), two of the most widely-used “merging congestion” management strategies, in both a separate and combined manner. However, there has been no detailed study regarding the combination of these systems in the face of high bus volume. This being the case, the ultimate goal of this study is to bridge this gap by developing and proposing a combination of VSL and RM strategies in the presence of high bus volume (VSL+ALINEA/B). The proposed model has been coded using microscopic simulation software—VISSIM—and its vehicle actuated programming (VAP) feature; referred to as VisVAP. For current traffic conditions, the proposed model is able to improve total travel time by 9.0%, lower the number of average delays of mixed traffic and buses by 29.1% and 81.5% respectively, increase average speed by 12.7%, boost bottleneck throughout by 2.8%, and lower fuel consumption, Carbon Monoxide (CO), Nitrogen Oxides (NOx), and Volatile Organic Compounds (VOC) emissions by 17.3% compared to the existing “VSL+ALINEA” model. The results of the scenario analysis confirmed that the proposed model is not only able to decrease delay times on the Metrobus system but is also able to improve the adverse effects of high bus volume when subject to adjacent mixed traffic flow along highway sections.

scholarly journals Influence of Strong Light on the Performance of Piezoresistive Pressure Sensor

2021 ◽  
Author(s):  
Mimi Huang ◽  
Libo Zhao ◽  
Zutang Wu ◽  
Xiangguang Han ◽  
Mingzhi Yu ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Simulation Software ◽  
Reflection Effect ◽  
Microscopic Simulation ◽  
Strong Light ◽  
Suppression Effect ◽  
Pressure Surface ◽  
Reflective Layer ◽  
Influence Mechanism ◽  
Piezoresistive Pressure Sensor

Abstract It is found that the strong light in the explosion field has great interference to the piezoresistive pressure sensor, then the shock wave data obtained by the sensor is distorted badly. To study the influence mechanism of the strong light on the piezoresistive pressure sensor, a strong light experimental platform is built. The positions of the sensor and the light source are adjusted, and the outputs of the piezoresistive pressure sensor are observed. Through microscopic simulation, the influence of different light intensities on the piezoresistive pressure sensor is analyzed. In order to reduce the influence of strong light on the performance of piezoresistive pressure sensor, we propose to add a reflective layer on the pressure surface of the sensor. The light reflection effects of different film thicknesses are analyzed through film simulation software. At the same time, the reflection effect is verified through experiments. To explain the effect of the reflective layer on the suppression of strong light, a simulation model is established, and the suppression effect of the reflective layer is verified.

scholarly journals The Impact of Emergency Parking Bays on Quasi-Eight-Lane Expressway Traffic Operations

2020 ◽  
Vol 12 (8) ◽  
pp. 3432
Author(s):  
Zhen Yang ◽  
Xiaocan Chen ◽  
Dazhi Sun
Keyword(s):  
High Volume ◽  
Traffic Volume ◽  
Simulation Software ◽  
Traffic Operations ◽  
Microscopic Simulation ◽  
Lane Changing ◽  
Traffic Demand ◽  
The Road ◽  
Traffic Operation ◽  
The Impact

Recently, with the discrepancy between increasing traffic demand and limited land resources, more and more expressways are choosing to use hard shoulders to expand into quasi-six-lane or quasi-eight-lane roads. Therefore, more emergency parking bays are used in place of traditional parking belts. However, there are no standards defining clear and unified specifications for the design of parking bays. This paper aimed to investigate the impact of emergency parking bays on expressway traffic operations with various traffic volumes and setting conditions. Based on the Monte Carlo method, VISSIM (Verkehr in Städten Simulation, a microscopic simulation software) simulation experiments were conducted using measured traffic operation data from one expressway in Zhejiang province. The probability of unsafe deceleration, lane-changing maneuvers and delay times were considered as the safety and efficiency indexes in this simulation study. The simulation results indicated that the emergency parking vehicle had an increasing impact on the following vehicle as the traffic volume increased. However, the impact pattern was found to be insensitive to the changing of the bay taper length. For low traffic volume, compared with the arrival vehicle, the departure vehicle had more impact on the traffic operation of the mainline. However, the impact of the arrival vehicle became more remarkable as the traffic volume increased. After parking, the waiting time for merging into the mainline was reduced as the volume decreased or as the bay taper increased. Furthermore, reductions caused by varying bay tapers were more significant under high volume conditions. Finally, this study suggests that parking bays are inapplicable when the occupancy of the road space exceeds 20% (about 3000 veh/h), because they would cause significant impact on the safety and efficiency of the expressway. The results of this paper are useful for the design and implementation of emergency parking bays.

Application of VISSIM in Public Transit Facilities Analysis and Evaluation

2013 ◽  
Vol 361-363 ◽  
pp. 2293-2296 ◽  
Author(s):  
Hong Zhou Cai ◽  
Shou Feng Ma ◽  
Li Wei
Keyword(s):  
Public Transit ◽  
Urban Transportation ◽  
Mutual Interference ◽  
Simulation Software ◽  
Level Of Service ◽  
Microscopic Simulation ◽  
Bus Priority ◽  
Left Turn ◽  
Analysis And Evaluation ◽  
Tianjin City

The level of service and efficiency of public transit facilities affect the functions of urban transportation. VISSIM as a microscopic simulation software is conducted to model the operation processes of public transit facilities in the Huayuan intersection located in Tianjin city of China. Three problems are found in this study as following: seriously mutual interference between buses and cars nearby the transit facilities, deficient capacity of left-turn lanes, serious delay at the intersection including buses and cars. Some improved measures are proposed to solve these problems in the research such as changing the location of bus stops, placing bus priority signs and adding lanes. These measures compose three improved schemes. The effects of these schemes are compared from travel times, delay, queue length and bus waiting time. The simulating results show that these schemes can effectively increase the speed of buses and reduce their delay at the intersection.

scholarly journals Performance Evaluation of a Hybrid Roundabout Using a Microscopic Simulation

2021 ◽  
pp. 47-81
Author(s):  
Yavuz User ◽  
Seyitali İlyas ◽  
Gultekin Tinaztepe
Keyword(s):  
Traffic Safety ◽  
Carbon Emission ◽  
Simulation Software ◽  
Current Status ◽  
Traffic Density ◽  
Accident Risk ◽  
Microscopic Simulation ◽  
Safety Feature ◽  
The Status ◽  
Junction Type

Roundabouts are one of the safest types of intersections. There are a number of roundabout types in literature. Each roundabout type is distinguished by some characteristics. To design more efficient junctions, hybrid roundabouts can be created by combining their required characteristics geometrically. In this study, the safety feature of the turbo junction type and the easing up the traffic density feature of the hamburger junction have been combined. Some geometric parameters and layout details of the proposed hybrid roundabout are given, and its performance was simulated in a signalised 4-leg roundabout as the most frequently used intersection in Antalya. The performance of the proposed hybrid roundabout was compared with the status in 2016 and the current status in 2017 and beyond of the roundabout through AIMSUN transport simulation software. In regard to performance analysis, delay time, travel time, speed, density, fuel consumption, number of stops, queuing, carbon emission were analysed for all statuses and compared. In addition, traffic safety analysis has been performed for all statuses and compared. Results show that the overall average performance of the proposed roundabout increases by 40% and 41.8% in comparison with the statutes in 2016, 2017 and beyond, respectively. The proposed roundabout is 41% safer than the status in 2016, and the accident risk is lower by 18.5% than the current status.

Microscopic Simulation on High-Class Roads: Enhancement of Environmental Analyses and Driving Dynamics: Practical Applications

2000 ◽  
Vol 1706 (1) ◽  
pp. 73-81 ◽  
Author(s):  
Ville Lehmuskoski ◽  
Jarkko Niittymäki ◽  
Björn Silfverberg
Keyword(s):  
Urban Areas ◽  
Management Strategies ◽  
Project Planning ◽  
Simulation Software ◽  
Urban Traffic ◽  
Detailed Calculation ◽  
Microscopic Simulation ◽  
Emission Analysis ◽  
Change Models ◽  
Practical Applications

Traffic is a very complex phenomenon. As the calculation power and capacity of computers have rapidly increased, the possibilities for modeling traffic corresponding better to reality have also increased. A noteworthy method for modeling is microscopic simulation of traffic, which can be used for a variety of needs. In general it can be stated that the interest in microsimulation lies in short-term functional studies rather than in the assessment of long-term needs. The design of concepts for traffic management strategies, especially for main transport corridors and urban traffic systems, constitutes a challenge for the user of microscopic simulation tools. In addition to practical project planning, microscopic traffic simulation can also provide a tool for research. Detailed calculation of emissions is of special interest in congested urban areas. Microscopic simulation of traffic provides comprehensive methods for detailed assessment of emissions as each individual vehicle is recorded with respect to its driving conditions and performance both in space and in time (speed, acceleration, deceleration). HUTSIM is a Finnish microscopic simulation software developed by the Helsinki University of Technology. Because it is rule based and object oriented, the operational comprehension of the software can be expanded quite easily. In many Finnish projects, HUTSIM has been expanded to better suit wide-scale applications. Development of emission analysis and lane-change models is described, as are future development outlines concerning modeling human behavior and analyzing the level of service using fuzzy methods.

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