فصلنامه جاده
سال بیست و دوم شماره 1 (پیاپی 78، بهار 1393)

Guide Signs as one of the primary means of traffic control, play an important role in controlling traffic flow. Guide Signs in addition to having the legibility and visibility, should be a way to convey the message to drivers, so that drivers between the signs and intersection, Recognize their own path. On the other hand, because of the limitations that exist in some of words on signs; at most two or three locations can be written on a sign. Hence, in this paper, with recognizing driver’s expectations by using method of Analytic Hierarchy Process (AHP); among the most important places ahead; the most important route can be used to insert the signs. Finally, it is determined that Vali-e-Asr Exp.-East , Bahrami Exp. , Airport Route and Gorgan-Mashhad , for direct and Vali-e-Asr Exp.-West , FarahAbad Blvd. and Sea for Right have a higher Priority than in other Places.

Fuel supply stations are considered as absorbent positions. Long and additional trips of vehicles to this location can cause social and economic losses in addition to increasing fuel consumption. According to dynamic behavior of traffic, inappropriate locating of fuel supply stations may cause it to be out of service spontaneously and because of this, it imposes more demands to the other stations. Abundance of parameters in this trend requires more precision and experiments so locating a needed position are a long-term decision making. In this, many priorities can affect the procedure such as politics, economy, safety or environmental features. Against the obvious and clear instructions of Islam about vulnerable people and the poor, they and their economic growth are often not considered as a policy of decision making because most of the policies are based on earning much more financial benefits. In this study, locating the fuel supply has been done with the aid of GIS software with the approach of budget allocation according to justice and economic growth of the poor. Suitable locating of the fuel supplies not only is not a troublesome to the other economic activities but also is a means of economic growth in the near future of the poor.

With regard to cross the railway tracks and roads paved most original and non-original geological sequences with dominant lithological clay, silt, marl and Physical and chemical characteristics of soils, Possible ways to increase the strength of fine-grained soils against stress in compression, tension and shear at different axis (a-axis) or the all-round use. In this study, a sample of random and systematic path of clay used for established and strengthened platform, try it with tests to determine the bearing CBR in both wet and dry clay without lime (natural) and lime percentages of 2 and 5, the optimum amount of lime to stabilize and strengthen the substrate with known test results to determine the amount of change in transportation mode (with lime and without lime) were identified. However technically soils were also tested and evaluated. The importance of this study is to determine the amount of materials and how to strengthen the project's context; especially in the area of excavation of clay sequence is obvious.

Allocating budget to enhance highways safety is one of most important factors for reducing the amount of traffic crashes in several countries. Since the financial always isnt enough, reaching equilibrium between existing budget and problem is essential. Since traffic tools are the most important factors in reducing traffic crashes, in this research a model is presented for determining the best safety traffic tools which has profound influential on traffic accident. In this research firstly cost of different kind of crash like fetal, injury, and property damage only accident evaluated. For this purpose several factors such as cost of curing injured people or cost which is impacted from dying or disability of people to the society are considered. Beside that for choosing the best safety improvement method for variety rural highway section linear programming implemented in cost-benefit analysis. This method is one of the efficient, one criterion decision method in increasing beneficial in economic project. In this model besides considering cost of accident as fundamental factor of decision, the restriction of budget and problem in different section of the road are considered. One of the most characterizations of this model is considering more than one safety activity simultaneously. Finally, as a case study and for the sake of research validation, 91 km of Urmia-Salmas road, in west Azerbaijan province, was modeled. The outcome of this case study was proved to be satisfactory in terms of a set of best safety tools measures. The result is indicated that using some of economic safety improvement activity such as utilizing rumble strip or utilizing and improving horizontal and vertical signs have great influence on reducing traffic crash in variety sections of road. However, if suggested safety improvement activities are expensive for some of the sections, it is possible none of suggested idea accept for this section because of budget restriction.

This paper present to simultaneously resolving the complex problem of outbound trains scheduling and objectives of railroad humping yard at the rail transport systems. Thus, it trying by suggest a new scheduling model for block to track assignment and humping yard problems in the railroad yard with four parts of receiving yard, hump yard, classification yard and departure yard. This paper is working on the railcars flow in the all yards, so that the fluid flow of load units and block in railcars will be occurred by sequence operations and scheduling of unloading and load classification inbound train, and other hand, solving the problem of how to allocate category blocks to outbound tracks in the best dwell time of blocks in route. This paper integrated four problem in four yards by define a unique mixed integer programming. For this work, in first part of, took place initially information gathering and extensive technical analysis on the problem and available resources. According to field studies have been conducted and data’s provided in the literature, present an efficient and attractive mixed integer programming model. Finally, suggest two solution methods for solving it. Primarily, use the Gams software and second way design a heuristic greedy algorithm for this NP-hard problem.

The extracted traffic information from satellite images is an important issue which is concentrated during the past two decades. The overall goal of this issue is to find the quantity of vehicles by separating the light and heavy vehicles in an aerial or satellite images. Due to the time consuming manual methods in this paper, the process is carried out by using image processing techniques. Extracting this information has many applications in different fields of science and practice of urban traffic management that became a direct need for the society. Therefore, access to the upgraded information and yet available to process will be so important. The presented method in this paper is, separating and counting vehicles using satellite images based on programming technique of GUI in the MATLAB software. The carried out separation is directly proportional with the image quality, thus, by having a high resolution image we can separate the light and heavy, two-or three-axis load vehicles or even all vehicles according to the Scheme Regulations. It seems that human accuracy should be use in extraction of traffic data as an effective factor. Also the cost and time issues as a serious impediment to access this information indicates more need to this software.