scholarly journals Alternatives to Improve Operational Traffic in Roundabouts Using Microsimulation

Respuestas ◽  
2020 ◽  
Vol 25 (2) ◽  
Author(s):  
Nelson Rincón-Numpaque ◽  
Luis Ángel Moreno-Anselmi ◽  
Kelly Andrea Rodríguez-Polo ◽  
Carlos Andrés Gaviria-Mendoza
Keyword(s):  
Flow Pattern ◽  
Travel Speed ◽  
Signalized Intersection ◽  
Design Solution ◽  
Traffic Demand ◽  
Urban Dynamics ◽  
Saturated Condition ◽  
Approach Speed ◽  
Final Design ◽  
Urban Arterials

Roundabout in urban arterials are likely to block roads or generate long queues of vehicles due to the constant changes on urban dynamics near to the interception. Several alternatives to modify the flow pattern or geometry and infrastructure need to be study previously to propose a final design solution of roundabout with traffic issues. In this study, a review of three alternatives to improve the operational traffic are discussed; signalized intersection, turbo-roundabouts and overpass/underpass. In addition, the application of these alternatives is evaluated in a “classic” roundabout located at Tunja city that has a maximum of 3691 Veh/h counted and it is operated in saturated condition.  Microsimulation is used from a calibrated model with volume counted, vehicle composition and speeds in the VISSIM software. Results show that signalize the roundabout does not improve the operational traffic (with a reduction on 38% of approach speed) and, the turbo-roundabouts are a mid-term solution that meet the traffic demand on 15 years with a progressively loss of service (with a  mean approach speed of 6.4 Km/h at 15 years). The constructions of underpass and overpass show to be the only solution that increase four times the travel speed throw the roundabout and keep acceptable speed at the end of cyclic live of intersection (18.7 Km/h at 20 years).

Multi-Objective Design and Selection of One Single Optimal Solution

2004 ◽  
Author(s):  
F. Levi ◽  
M. Gobbi ◽  
M. Farina ◽  
G. Mastinu
Keyword(s):  
Optimal Solution ◽  
Engineering Problem ◽  
Design Solution ◽  
Pareto Optimal ◽  
Large Set ◽  
Pareto Optimal Solutions ◽  
Optimal Solutions ◽  
Pareto Optimal Set ◽  
Final Design ◽  
Selection Of

In the paper, the problem of choosing a single final design solution among a large set of Pareto-optimal solutions is addressed. Two methods, the k-optimality approach and the more general k-ε-optimality method will be introduced. These two methods theoretically justify and mathematically define the designer’s tendency to choose solutions which are “in the middle” of the Pareto-optimal set. These two methods have been applied to the solution of a relatively simple engineering problem, i.e. the selection of the stiffness and damping of a passively suspended vehicle in order to get the best compromise between discomfort, road holding and working space. The final design solution, found by means of the k-ε-optimality approach seems consistent with the solution selected by skilled suspensions specialists. Finally the k-optimality method has proved to be very effective also when applied to complex engineering problems. The optimization of the tyre/suspension system of a sports car has been formulated as a design problem with 18 objective functions. A large set of Pareto-optimal solutions have been computed. Again, the k-optimality approach has proved to be a useful tool for the selection of a fully satisfactory final design solution.

scholarly journals Olifants River Bridge Widening

2018 ◽  
Vol 199 ◽  
pp. 10007
Author(s):  
Andrew Rowan ◽  
Les Thomson
Keyword(s):  
Reinforced Concrete ◽  
South African ◽  
Design Solution ◽  
The South ◽  
Dead Weight ◽  
Remote Location ◽  
Final Design ◽  
Olifants River ◽  
Durability Performance

The Olifants River Bridge B3611 carries the N11 over the Olifants River, just North of the Loskop Dam. This structure was originally built in 1979 and was recently widened as part of the South African Roads Agency Limited (SANRAL)’s upgrade to the N11. At the time of design, very little was known about the bridge as no ‘As Built' drawings were available. Due to the remote locality of the structure, exploratory investigations were reserved until the construction phase. The final design solution was therefore amended during the construction phase in order to account for the reinforcement found within the structure. In addition to the heavier dead weight of the new widened deck, the bridge would be required to carry higher loads under modern loading codes. Widening works included new widened cantilevers with new reinforced concrete balustrades, tying into existing reinforcement. Strengthening for bending was provided to the main deck beams by means of longitudinal FRP plates epoxied to the soffit. Transverse pierhead strengthening using DYWIDAG bars was installed to counter increased moments, and pier strengthening using a reinforced concrete jacket was implemented to strengthen the piers. Durability concrete was specified in accordance with current SANRAL regulations and the durability performance of the concrete, even in this remote location was excellent. This paper summarises the work that was completed as part of this project.

scholarly journals Control Method for Signalized Intersection with Integrated Waiting Area

2019 ◽  
Vol 9 (5) ◽  
pp. 968 ◽  
Author(s):  
Xiaomei Xia ◽  
Xiaodan Ma ◽  
Jin Wang
Keyword(s):  
Traffic Congestion ◽  
Control Method ◽  
Heavy Traffic ◽  
Control Process ◽  
Simulation Software ◽  
Signalized Intersection ◽  
Traffic Demand ◽  
Key Issues ◽  
Waiting Area ◽  
Implementation Effect

To alleviate traffic congestion in the city, an integrated waiting area is introduced to the signalized intersection in this paper. After the design idea and the typical form of the integrated waiting area is proposed, the control method at the signalized intersection is discussed. The coordination control process of the main and pre-signal at the signalized intersection with the integrated waiting area is analyzed and modeled. To assess the operational performance of the integrated waiting area at intersections, a microscopic traffic simulation software (VISSIM) is utilized to simulate intersections with and without integrated waiting areas. Key issues concerning signal timing plans are then discussed. With comparisons between the operation of intersections with and without integrated waiting areas, the implementation effect is quantified based on the statistical data of the simulation result. The results confirm the potential benefits of the integrated waiting areas at the signalized intersections and show that integrated waiting areas work best in heavy traffic demand.

Images of users and products shown during design processes increase users’ willingness to use the design outcome

2010 ◽  
Vol 24 (2) ◽  
pp. 179-189 ◽  
Author(s):  
Bo T. Christensen
Keyword(s):  
Cognitive Science ◽  
Design Process ◽  
End Users ◽  
The Other ◽  
Incremental Innovation ◽  
Design Solution ◽  
User Characteristics ◽  
End User ◽  
Final Design ◽  
Willingness To Use

AbstractTwo studies tested whether introducing images to designers during the design process lead to more useful design solutions as evaluated by the end users’ willingness to use the final design. It was hypothesized based on theories in cognitive science and design that there were at least two paths from images to usefulness. One path concerns analogically transferring within-domain properties to the design solution. The other path concerns mentally simulating end-user characteristics and preferences and inclusion of the user in the resulting design. Study 1 supported that random images led to increased outcome usefulness, and supported both hypothesized paths, by using within-domain products and end-user images as input. Study 2 showed that the image categories competed for attention, and that the within-domain product stimuli attracted the most attention and was considered the most inspirational to the designers. The practical use of the technique may lead to only marginally original products perhaps limiting its applicability to incremental innovation.

Analysis and Design of the “Solar One” Thermal Storage Subsystem Heat Exchangers

1984 ◽  
Vol 106 (3) ◽  
pp. 279-285
Author(s):  
F. R. Weiner
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Thermal Storage ◽  
Design Solution ◽  
Process Conditions ◽  
Analysis And Design ◽  
Heat Exchanger Design ◽  
Central Receiver ◽  
Final Design ◽  
Design Requirements

This paper describes the analysis and design of the five kinds of heat exchangers used in the thermal storage subsystem of the 10 MWe Solar Central Receiver Pilot Plant, now becoming more known as “Solar One.” The paper discusses the practices and standards used in the designs of the heat exchangers, lists the heat exchanger design requirements, and discusses the process conditions. The design assumptions and constraints, the geometrical considerations, and the tradeoff studies that were conducted to optimize the designs are also discussed. A description of each heat exchanger reveals the final design solution. Novel and unique features of a power plant that must operate on a daily sun-cycle are identified.

A Coding Scheme for Analyzing Capstone Design Reports: Problem and Solution Descriptions

2011 ◽  
Author(s):  
Shraddha Joshi ◽  
Joshua D. Summers
Keyword(s):  
Engineering Students ◽  
Level Of Detail ◽  
Design Solution ◽  
Final Solution ◽  
Problem Statement ◽  
Design Problems ◽  
Coding Scheme ◽  
Engineering Problems ◽  
Final Design ◽  
Capstone Design

It is desirable that the graduating engineering students possess the skills of formulating and solving engineering problems to design solutions that meet the established requirements. However, the current literature has noticeable gaps pertaining to understanding how the formulation of design problems and establishment of requirements affect the final design solution. The ultimate goal of this research is to understand the influence of the level of detail of problem statement and requirements on the level of detail of final solution. In order to accomplish this goal a coding scheme is developed to systematically code the information in the final design reports from capstone design class collected over a period of ten years from 1999 to 2008. The coded information is used to develop mappings between problem statement and final solution. To this end, this paper describes the scheme for systematically coding the problem statement and final design solution.

scholarly journals Geotechnical design of railway embankments – requirements and challenges

2019 ◽  
Vol 262 ◽  
pp. 11002
Author(s):  
Witold Bogusz ◽  
Tomasz Godlewski
Keyword(s):  
Developed Countries ◽  
Design Solution ◽  
The European Union ◽  
Technical Standards ◽  
Safety Requirements ◽  
Railway Infrastructure ◽  
Final Design ◽  
European Regulations ◽  
Geotechnical Design ◽  
European Standards

Intensive development of railway infrastructure in Poland is associated with significant support provided for that purpose by the European Union, especially, by investments in the modernization of existing railway lines. Together with the improvement of the infrastructure in less developed countries, an interoperability of rail system at the international level is sought through the technical harmonization, mostly by the introduction of European regulations and technical standards. The paper presents the main requirements associated with the geotechnical aspects of design of railway embankments, mostly relating to their overall stability and maintenance of serviceability. Some aspects of the European standards as well as international, national, and internal regulations, are discusses in the context of challenges encountered by designers. The main geotechnical issues are associated with safety requirements, loading conditions, geometry of railway embankments, as well as the scope of geotechnical investigation necessary to make an informed decision on a final design solution.

Design Locally: Validate Globally

1995 ◽  
Vol 39 (3) ◽  
pp. 177-181
Author(s):  
Erich Elkins ◽  
John E. Quinn
Keyword(s):  
User Interface ◽  
Cultural Differences ◽  
Design Process ◽  
Metropolitan Areas ◽  
International Markets ◽  
Lessons Learned ◽  
Design Solution ◽  
User Testing ◽  
European Cities ◽  
Final Design

A process for developing the user interface and the industrial design for products intended for international markets is presented. The process was derived from lessons learned while developing a business telecommunications device. The device required an interface that was easier to use and a product design that would be attractive to worldwide business users. The design process was based on two iterations of user testing. The first iteration included 51 users from three major U.S. metropolitan areas; while the second had 294 users from four European cities, three U.S., and two Asian. The recommended process requires that multiple competing designs be presented to users for iterative validation and revision before selecting the final design. The competing designs increase the likelihood that cultural differences are met and the best design solution is achieved.

Evaluation of Signalized Intersection Service Level in the Traffic Impact Assessment

2013 ◽  
Vol 869-870 ◽  
pp. 327-333
Author(s):  
Qian Wang ◽  
Chun Fu Shao
Keyword(s):  
Impact Assessment ◽  
Traffic Flow ◽  
Service Level ◽  
Signalized Intersection ◽  
Traffic Demand ◽  
The Road ◽  
Traffic Impact ◽  
On The Road ◽  
Vehicle Capacity ◽  
The Impact

Traffic Impact Assessment focuses on analysis and evaluation of the traffic flow generated by the proposed project impact on the road network in the future, through comparing the sections,intersection and other transportation infrastructure indexes such as traffic flow and road vehicle capacity, evaluate whether the traffic system can meet the increased traffic demand. In this paper, make the delay time and the road saturation as the evaluation index, studies the influence scope of the key signal intersection service level, in order to assess the impact of new projects on the signalized intersection. Cited Haikou province Hongzhou center as an example, based on the investigation of the traffic flow, calculate the time delay and road saturation to analyze the service level.

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