Abstract
A Comparison between SAW and WIM Systems on Highways.
Highlights
Transport of materials by trucks on highways has considerably increased in recent years, the movement of materials and transporting have maximized, and the goods, products, and wares have increased and transported to projects and firms to continue their works, when comparison this matter with state of twenty years ago, we see that the average of roads damages and defects increased highly, because more trucks with their loads are move per a day on many highways in most cities of different countries, they bring goods or supply projects with different materials, in an international report [1] there are more than 250 million trucks with their loads moving on the highways in the world
We got some results, the cities become larger and more trucks are moving between cities worldwide, many industrial firms were built, number of moving trucks per a day were increased, more industrial and commercial firms comes out, the occupation highways by loaded trucks were very increased, more road congestion occurred till and larger damages, defects, and losses were happened to roads and pavements in last years as a result of extra loads more than permitted limits of the loading
We found that there are many static weighing process of SAW is installed on highways and operating in most countries, and is assumed as old system when compared with working methods of WIM system
Summary
Transport of materials by trucks on highways has considerably increased in recent years, the movement of materials and transporting have maximized, and the goods, products, and wares have increased and transported to projects and firms to continue their works, when comparison this matter with state of twenty years ago, we see that the average of roads damages and defects increased highly, because more trucks with their loads are move per a day on many highways in most cities of different countries, they bring goods or supply projects with different materials, in an international report [1] there are more than 250 million trucks with their loads moving on the highways in the world. 4(9), 1470-1479 of trucks and axel numbers to bear increased loads and any excess over these limits will bring a lot of unsafe conditions and make damages and defects in basic roads components, for this reason, it brings greater losses and it should spend extra efforts to achieve repair and maintenance. Figures 1& 2 show photos examples of damages and defects of highways, and in order to eliminate these losses and efforts, it should be front continuous increased numbers of trucks, and use other weighing process such as WIM which become an urgent requirement, at first WIM compared with SAW to indicate qualitative and quantitative features, in order to select best way of weighing without losses and time interval, and to resist raised loads and moved trucks. With SAW the control becomes difficult more than before, because many losses and road congestion were made, more damages occurred
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