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ECONOMICAL EVALUATION OF CONSTRUCTING Urban TRANSPORTATION INFRASTRUCTURES IN CONGESTED CORRIDORS ( CASE STUDY : SADR HIGHWAY )
| Content Provider | Semantic Scholar |
|---|---|
| Author | Saffarzadeh, Mahmoud Mirbaha, Babak |
| Copyright Year | 2011 |
| Abstract | Investment and construction of transportation infrastructures are some of the most complex issues that confront government authorities. Uncertainty in the benefits of such infrastructures and, difficulty in scaling costs to financial profits, create doubts in the decision making process. Congestion, pollution, noise and other issues have significant costs and, therefore, the initial cost of the infrastructure cannot be a proper comparison factor for its economical assessment. Therefore, it seems necessary to analyze the demand in the horizon year, considering the current situation and using the outcome of planning studies and in the next step, evaluating construction and operation costs next to the project profits which can lead to more feasible decisions. One of the main challenges in analyzing the effects of construction a new road transportation or improving an existing infrastructure is the limitations related to the effect of these projects on future traffic pattern. So, the main question is the method of evaluation of these changes for defining their benefits which makes the main subject of this research. The method considered in this research is applying planning software (Emme2) for estimating the demand caused by these changes in the network. The cost groups (in addition to the capital cost) are congestion and emission which caused by vehicles. The methodology for estimating these costs are based on recent researches by Ozbay et al & Brenchman et al which defined congestion and pollution costs as follows[1,2,3]: Where: Q: Flow (veh/h) da,b: Distance (mile) C: Capacity (veh/h) VOT: Value of Time ( $ ( /h) VO: Free Flow Speed (mph) The first model is applied when the network is under saturated. The second model which was applied for estimating pollution cost is as follows: 4 , 1 0.15 a b cong o d Q C Q VOT V C = + 2 1 15 . 0 1 4 , VOT C Q Q VOT C Q V d Q C o b a cong − + |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://transp-or.epfl.ch/heart/2012/latsis2012_submission_6.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
