A Comparison between SAW and WIM Systems on Highways.

Weigh-in-Motion \"WIM\" is a new system for weighing process of trucks loading material loads which is strongly required to be operated on highways anywhere, it is required to replace Stationary Axle Weigh \"SAW\" system which is now used for weighing process of trucks with their loaded materials in many countries and the systems are managed by local transporting authorities. WIM holds many advantages; it can give effective results and assist to preserve roads from damages and defects more than SAW. The size of transporting materials has maximized in recent years and average of trucks numbers with extra loads has much increased. SAW is operated now but it cannot balance progressed state, millions of trucks with their loads are move now on highways worldwide, in order to make balance with new state, it is too required to use new system of WIM on highways, therefore the installation is vital issue and comparison between WIM and SAW is necessary to know their operating data. Many studies have affirmed that WIM can give greater advantages than SAW and higher quality level can be obtained because WIM consists of two stages of weighing process and contains new equipment and devices, and it can better monitor the process, and preserve roads component. SAW will lead to more time and losses, and there are many differences between them. As a new topic, the comparison between SAW and WIM is regarded as new approach to indicate their system\'s operating, required specific equipments, differences, and advantages of both systems. As a new tactic, the comparison between them comes via detailed data about components, installation, quality standards, and discusses their comparison elements