Abstract
Any change in the geometric configuration of the existing road affects other dependent elements such as travel time, fuel consumption, and existing pavement. This paper quantifies these effects and finds an optimum geometric configuration. Three separate models are developed in this research: (1) the travel time model which predicts vehicles flow speed on the specified geometric condition, traffic composure, and evaluates the imposed costs to the road users; (2) the fuel consumption model, which estimates needed propulsive force and anticipated fuel for vehicles passing through the road; and (3) the pavement rehabilitation cost model considering two main constraints of existing pavement condition and project line elevation. The developed pavement rehabilitation model proposes the best solution for pavement rehabilitation practice and computes associated costs. Particle Swarm Optimization (PSO) is used to find the optimum solution in a minimization problem search space. The proposed model is applied to a real-world case study. Results show that there is an extremely less tendency for change, even with the existence of adverse geometric conditions, when there is a relatively good pavement condition. In the case of deteriorated pavement conditions, economic justification for geometric modification is required.
Highlights
Road rehabilitation mostly divides into two different categories: (1) the geometric modification of the road which would be conducted in a certain condition such as accident vulnerability prevention, traffic flow enhancement, access adjustment, etc., and (2) pavement rehabilitation which would be conducted on a regular basis and depends on the pavement condition
The cost models used in the proposed method in this research including fuel consumption cost related to the travel time of passing vehicles and pavement rehabilitation accompanied costs are discussed in detail
The results of the cost function for fuel consumption are mostly the same while there are some major differences in travel time cost and pavement rehabilitation cost
Summary
Road rehabilitation mostly divides into two different categories: (1) the geometric modification of the road which would be conducted in a certain condition such as accident vulnerability prevention, traffic flow enhancement, access adjustment, etc., and (2) pavement rehabilitation which would be conducted on a regular basis and depends on the pavement condition It may be done all over the road pavement, such as a complementary overlay, which mostly applies in the second half of the pavement designed life and may apply in certain segments of the pavement that locally suffer from deteriorated conditions. Any change in the geometric design of an existing roadway causes a high capital investment in the construction because of excavation, embankment, pavement construction, and other existing constraints, as well as travel time and fuel consumption The sensitivity of these parameters and their impacts on overall cost are different in nature
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