This report is the final report of the results in the EU REFLEX project. REFLEX is the acronym for "Reinforcement of Flexible Road Structures with Steel Fabrics to Prolong Service Life". The final report or guidelines will show where, when and how to use steel reinforcement fabrics in road construction for the improvement of the service life of the road. The guide will describe the new design method, which at the same time is an improved rehabilitation methodology for asphalt roads. The guidelines will be further developed by the different partners and introduced into the different national markets. The result will be used by the different partners for the exploitation and implementation of the project results. Steel manufacturers will use the report when making marketing material; road administrators will implement the results in their design guidelines, create national guidelines etc. The target group for the Guidelines are municipalities, road administrations, civil aviations, contractor and consultants. The main objective of the REFLEX project is to develop a new technology for road construction and rehabilitation. The idea is to use steel fabric reinforcement in asphalt roads in order to make road structures more cost effective by improving the lifetime of new constructed roads and by developing an optimal rehabilitation method for existing roads.