فهرست مطالب رضا حفظ الله

By consideration of spreading roads, increasing vehicles, a consequently increasing inner-outer travelling, accidents and violations turned into significant problem in the part of road transportation. In this regard, The aim of this study is evaluating the effect of increasing the number of vehicles on increasing the number of accidents an violations in Bushehr-Brazjan is considered as an important and related place to answer the question which cause the traffic accidents, on the other hand, related to this problem a few studies have been implemented on the Bushehr-Brazjan road. This research is a descriptive-analytical study that Bushehr-Brazjan road axis was studied as a research road axis based on available information and based on statistics of violations due to speed, unauthorized distance and road accidents in the mentioned freeway. Given that the data collected is quantitative and the research seeks to investigate and determine the relationship between the variables, Pearson correlation coefficient has been used to measure the relationship. Also, according to the distribution diagram between the dependent variable and the independent variable indicating the existence of a linear relationship between the variables linear regression has been used. Relevant information was collected and evaluated in consecutive years (2014-2019). The results showed that the increase in the number of vehicles affected on 93% of accidents, 83% of speeding violations and 81% of speeding violations. Also, by considering the independent variables and the use of the multivariate linear regression equation, the number of accidents for the coming years can be predicted.

One of the biggest infrastructural assets of the country is the road. Due to the heavy costs of repair and improvement, preventive methods and increasing the life of the pavement can play a special role in reducing the costs of the pavement life cycle. At present, according to the goals set in the road pavement management system (PMS) special attention has been paid to the implementation of chip seal and fog seal protection asphalts. Accordingly, in this study, a review of research on chip seals and fog seals such as evaluation tests and proposed quality control methods, review and comparison of implementation methods, use of additives, and environmentally friendly materials has taken. Then, based on the values of the pavement management system indicators of the roads and the classification of methods for improving the pavement condition index (PCI), the international roughness index (IRI) of the roads in Bushehr province and predicting the estimated cost ratio of operations of each category, the performance of chip seal and fog seal have been studied in a number of major road in Bushehr province. the review a shows that, in order to improve the performance and reduce the executive problems, It is beneficial to use environmentally friendly additives and modifiers. Evaluation and quality control of materials and execution also play an important role in the final performance of chip seals and fog seals. Finally, the implementation of chip seal and fog seal protective layers is effective in reducing the cost of pavement life.