Every municipalities designate urgent transportation routes as go on smoothly rescue and transport relief supplies in preparation for disaster. On preparation of life-extending repair plan, the bridges on urgent transportation route evaluated one of the important factors, but it is not examined that the urgent transportation network is active or not in times of disaster.
 This study aims to examine the ability to maintain urgent transportation network under the increase of bridge destruction risk associated with bridge deterioration, and furthermore visualize the result. These analytical processes in this study indicate that the disruption risk of network with few damaged bridge is increasing.

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 There are more than seven hundred thousand bridges in Japan, and there are a lot of unprobed bridges. Bridge administrators are suffering from lacking of budget and engineers. Thus, we developed winch wiring robot system, named as ARANEUS. The ARANEUS has eight independent controlled winches and hanged by eight wire under a bridge. And, The ARANEUS equips gyro sensor, network camera. We describe a system configuration of the robot, and experiment for verification on a real bridge.

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 The network of expressways in Japan has been constructed for more than 50 years starting from Meishin Expressway that connecting Kobe and Nagoya. As part of basic infrastructure, the expressway network has been playing an indispensable role in supporting the social and economic activities in the country and is expected to maintain its serviceability for another 50 years. However to ensure the long-term serviceability of the expressway network, it is essential to keep appropriate maintenance works, rehabilitate or replace the expressway structures and facilities when needed. In this paper, systematically investigated are the major factors causing the damage of expressway structures based on the results of structural soundness estimation and inspections done on all of the expressway structures and facilities under the control of the East, Central and West Expressway companies at the time of 2011. Based on the investigation, the prospect of long-term degradation of the expressway structures is estimated. The long-term plan of replacement and rehabilitation of the expressway structures is with a purpose to keep a reasonable serviceability of the expressway network for a longer period.

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