Problems and Suggestions on Dike Road Designs

2013 ◽  
Vol 443 ◽  
pp. 701-706
Author(s):  
Hao Wei
Keyword(s):  
Network Design ◽  
Classification System ◽  
Road Network ◽  
Landscape Design ◽  
Public Works ◽  
Design Standards ◽  
Early Design ◽  
The Road ◽  
Road Design ◽  
Water Conservancy

Dike roads include water conservancy projects and highways or public works, so the industry cross exists in designs. During the process of dike road designs, there exists problems such as disjointed dike designs and road designs, the lack of adaptation classification system and design standards, inconsistent requirements of embankment compaction and subgrade compaction, the lack of a connection with the inner road network design and green landscape design and other issues. We should fully consider the differences between dike design and road design, according to the particularity of the road dike, and we have proposed several proposals, such as increasing related indicators in the early design of the dike road design, establishing the dike road classification system, uniforming embankments and subgrade compaction standards, strengthening connections with the surrounding road network design and paying attention to greening landscape designs.

Projecting vector-based road networks with a shortest path algorithm

2004 ◽  
Vol 34 (7) ◽  
pp. 1444-1457 ◽  
Author(s):  
Axel E Anderson ◽  
John Nelson
Keyword(s):  
Sensitivity Analysis ◽  
Road Network ◽  
Road Networks ◽  
Design Standards ◽  
Road Density ◽  
The Road ◽  
Additional Information ◽  
Road Design ◽  
Manual Methods

Manually designing road networks for planning purposes is labour-intensive. As an alternative, we have developed a computer algorithm to generate road networks under a variety of assumptions related to road design standards. This method does not create an optimized road network, but rather mimics the procedure a professional might use when projecting roads by hand. Because many feasible road networks are possible, sensitivity analysis is required to choose the best ones. Such analysis gives forest planners additional information with which to assess the long-term consequences of road density and road standards common in forest management decisions. The procedures used to create road networks are presented in this paper, along with a sensitivity analysis of assumptions on total network length, percentage of landings connected, grades, and horizontal and vertical alignment for a case study. We also include a sensitivity analysis of spatial detail such as node density and link characteristics. Although the road network generation algorithm requires manipulation of many input parameters to create desired road networks, and variation between outputs is a concern, the method still offers considerable improvement over manual methods, especially for applications in strategic planning, and appears to be suitable for all types of topography and road standards.

Safety at Curves and Road Geometry Standards in Some European Countries

1996 ◽  
Vol 1523 (1) ◽  
pp. 99-106 ◽  
Author(s):  
Thierry Brenac
Keyword(s):  
Urban Areas ◽  
National Standards ◽  
European Countries ◽  
Design Standards ◽  
The Road ◽  
Horizontal Curves ◽  
Road Design ◽  
Road Geometry ◽  
Design Speed ◽  
Curve Geometry

This paper deals with safety at horizontal curves on two-lane roads outside urban areas and the way the road design standards of different European countries account for this safety aspect. After a review of some research results, the main aspects of curve geometry and the curve's place in the horizontal alignment are analyzed. The main conclusions are that the traditional design speed approach is insufficient and that formal complementary rules in road design standards, especially to improve compatibility between successive elements of the alignment, must be introduced. If such complementary rules already exist in some national standards, they are neither frequent nor homogeneous throughout the different countries, and it seems that they are not based on sufficiently developed knowledge.

scholarly journals A Review of Policies on Geometric Design of Freeways: Portugal and United States of America

2018 ◽  
Vol 3 (1) ◽  
pp. 11-25
Author(s):  
Lígia Conceição ◽  
Carlos Rodrigues
Keyword(s):  
United States ◽  
Comparative Analysis ◽  
Network Design ◽  
Cross Section ◽  
United States Of America ◽  
Road Network ◽  
Geometric Design ◽  
Geometric Parameters ◽  
Design Standards ◽  
American Policy

Once freeways are classified as arterial systems, they are directly associated to accessibility which has implications on efficiency of a road network design. The geometric design standards influence the freeways’ conception and operation and, therefore, they certainly have an impact on accessibility and the country’s development.A comparative analysis of geometric design of freeways was focused on two policies, both from Portugal and United States of America. The data gathered the geometric parameters regarding the design controls, criteria, elements of design and cross section elements.The major finding of this review infers that the Portuguese Policy imply wider and extensive freeways that arise from strong restraints in the minimum values of geometric parameters. This reflects on higher safety frame. The American Policy is less conservative which may reflect on slender geometric freeways, in comparison with the Portuguese. Therefore, it may be assumed that the American Policy designs less expensive freeways.

A solution to the road network design problem for multimodal flow

2016 ◽  
Author(s):  
Saeed Asadi Bagloee ◽  
Majid Sarvi ◽  
Abbas Rajabifard ◽  
Russell George Thompson ◽  
Meead Saberi
Keyword(s):  
Network Design ◽  
Design Problem ◽  
Road Network ◽  
Network Design Problem ◽  
The Road

scholarly journals TRAFFIC FORECASTING ON THE CITY ROAD NETWORK TAKING INTO ACCOUNT THE CAPACITY LIMIT

2021 ◽  
Vol 2 (2) ◽  
pp. 27-33
Author(s):  
Denys Zhezherun
Keyword(s):  
Transport System ◽  
Road Network ◽  
Road Traffic ◽  
Traffic Intensity ◽  
The Road ◽  
Traffic Forecasting ◽  
Planning Decisions ◽  
Road Design ◽  
Traffic Volumes ◽  
On The Road

The purpose of the paper is to present a model of traffic forecasting on the road section based on a model of the transport system. Traffic forecasting is an integral part of the road design process, from investment to the feasibility study of working documentation. The definition of transportation and distribution of cars by sections is based on a set of interrelated factors. Full and reasonable consideration of these factors for complex road networks is possible only with the help of mathematical models and appropriate programs. The accuracy and consistency of the forecast determine the reliability of almost all the main characteristics of the projected object, from the direction of the route and the location of connection points with existing elements of the road network, ending with specific planning decisions for the road objects. Subject of research: a road traffic and a traffic intensity. Knowledge of forecast data on traffic intensity makes it possible to predict the possible mechanisms to solve the above problems. Methodology: analysis and research of methods used to predict traffic volumes. The method of extrapolation and the method of using approximating functions. Goal. The aim of the work is to compare the forecasting methods used to determine traffic on the road. It is also necessary to show the experience of traffic forecasting on the road network from a European country. Conclusion. All methods for predicting the volume and intensity of movement are short-lived, and if some achieve the desired predicted result, it is very vague and needs to be tested with complex and expensive research to determine and process the initial data. To achieve the desired results, it is necessary to apply new methods of forecasting modeling or improvement of already known ones, which would take into account the evolution of the entire transport system and its components. Determining the capacity of highways is necessary perform to identify areas with possible congestion, assessment economy and conditions of movement of vehicles, and also for a choice of methods and means to improve the traffic conditions of all road users.

Demonstrative Case of a Pedestrian Network Design Model Considering Effects on Motorized Traffic

2020 ◽  
Vol 2674 (7) ◽  
pp. 373-384
Author(s):  
Christina Iliopoulou ◽  
Maria Tseliou ◽  
Konstantinos Kepaptsoglou ◽  
Stratos Papadimitriou
Keyword(s):  
Network Design ◽  
Road Network ◽  
Ad Hoc ◽  
Decisive Role ◽  
Design Guidelines ◽  
Design Model ◽  
Urban Network ◽  
Urban Networks ◽  
The Road ◽  
Pedestrian Network

The transformation of urban roadways into pedestrian streets is a popular measure for reshaping city parts and enhancing their livability. Nevertheless, pedestrianization schemes are expected to have some impact on the performance of the neighboring road network, especially if these are established ad-hoc or solely based on non-transport criteria. This study introduces a methodological tool for supporting decisions on implementing pedestrianization schemes in urban networks. A bi-level network design model variant is developed for that purpose, whose design objective is to maximize the extent of pedestrian streets in an urban network, while maintaining acceptable impacts to the performance of the road network. Alternative decisions on pedestrianization are considered for each network segment; these include partial (one-directional) or complete (bi-directional) pedestrianization under physical and operational criteria and constraints. The model is applied for a mid-sized urban network in Greece and solved using a genetic algorithm. Results show that the pedestrianization of almost 7% of the road network in relation to length leads to a 40% increase in total network travel time, while a higher ratio of complete versus partial pedestrianization is more advantageous. Outcomes also reveal that that rigid design guidelines should be examined in a case-by-case approach, as superior results may be attained if some constraints, such as those related to the overall street width, are relaxed. Reasonably, policy priorities significantly impact generated solutions and are expected to play a decisive role in the design of pedestrianization schemes.

Transit Network Design Model Based on Transport Efficiency

2014 ◽  
Vol 505-506 ◽  
pp. 840-844
Author(s):  
Shu Zhi Zhao ◽  
Hua Sheng Liu ◽  
Xiao Liang Zhang ◽  
Qing Fei Tian
Keyword(s):  
Network Design ◽  
Road Network ◽  
Shortest Paths ◽  
Coefficient Matrix ◽  
Transport Efficiency ◽  
Transit Network ◽  
The Road ◽  
Network Transport ◽  
On The Road ◽  
Transit Network Design

Transit network design is an important part of urban transportation planning. The purpose of this paper is to design transit network considering transport capacity constraint. The aim of the proposed method is to maximize transport efficiency of network. Transport efficiency and routes impedance are defined based on the road restriction coefficient matrix. The k-shortest paths algorithm is applied to search efficiency route and the highest efficiency route is selected to be laid on the road network. Then, station OD matrix is updated considering station capacity. The model is illustrated with data from Siping city, China and results show that the transport efficiency of transit network is highest and meet the correlative design norms. Therefore, the model got a higher practical value.

scholarly journals Sustainable road-kill mitigation in Gladak Perak Bridge at Lumajang, Indonesia

2021 ◽  
Vol 907 (1) ◽  
pp. 012028
Author(s):  
P S Wulandari ◽  
H R Lestyana ◽  
Johnson ◽  
J F Tranggono
Keyword(s):  
Traffic Accidents ◽  
Design Standards ◽  
Road Kill ◽  
The Road ◽  
Road Design ◽  
Road Users ◽  
Research Site ◽  
Prone Area ◽  
Animal Migration ◽  
Tourism Potential

Abstract Traffic accidents involving animals occur every year. Roadkill is a serious problem faced by the whole world, including Indonesia. Therefore, it is necessary to modify road accessories to prevent accidents, both from animals and road users. Prevention can be done in several ways, such as by installing fences or creating crossing paths, for animals. The fence can be used as a barrier between the driving lane and the animal path, where they can carry out activities such as playing without disturbing road users. Meanwhile, the making of crossing paths can be used by animals as access for animal migration. This study would like to propose a design for implementing cross-fencing mitigation at Gladak Perak Bridge at Lumajang, Indonesia. This location is an accident-prone area due to the sudden crossing of monkeys, which has been a myth in the community. Through the implementation of the installation of road dividers, it is hoped that the road design at the research site becomes wildlife friendly road and the management of traffic also meet the Indonesian design standards for inter-city roads without reducing tourism potential.

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