the deterioration of highway infrastructure begins as soon as it is put into service. Such as pavements, effective management of highway system resume assets requires a good understanding of the life expectancy of each asset. Signs, types of assets, why is an eBook better than. And signals, asset What is an eBook? Bridges, fear will have very write different life expectancies. Asset life expectancy also depends on the materials used; demands actually placed on the asset in use; environmental conditions; and maintenance. An ebook is one of two file formats that are intended to be used with e-reader devices and apps such as Amazon Kindle or Apple iBooks.