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.
Speed humps are known as the most popular traffic calming devices, although they transfer upward acceleration and forces to the vehicle which traverses them. These forces cause serious damages on vehicles and effect on passenger's discomfort. The main purpose of this paper is to investigate the vehicle's dynamic response to different type of speed humps via dynamic simulation modeling. Vertical acceleration, vertical force, and suspension force (spring force) were considered in order to study the vehicle's dynamic respond on speed humps. Totally, 90 simulation tests were run on a sedan passenger car and a typical truck (loaded) for 9 different hump's profiles. According to the results, ramp's length has the most effect on the dynamic performance of flat topped humps. Parabolic profile 3.65*0.1 (height=3.65m, length=0.1m) has the worst dynamic performance between all of speed humps. Also, sinusoidal profile seems to be a proper option from the viewpoint of hump's efficiency. However, it acts more vertical acceleration on vehicles in compare to all of flat topped profiles.
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