As a basis for signposting on the public road network, specific signage plans must be drawn up. A major problem is that there are no clear guidelines for how signage plans should be made or processed. Furthermore, no tools exist to secure and efficiently coordinate different plans that mutually influence each other. Therefore, there is a specific need to develop a common standard for road signage planning. A great many aspects, with regard both to the planning process and to the design of plans, need clarification, This Master Thesis is part of a larger research project called "A common standard for road signage planning" conducted at SWECO VBB. This project aims at demonstrating a computerized road signage application and to give recommendations about what standards for road signing planning to use. The aim of the master thesis is to introduce usability aspects to the application development process, and to examine whether ArcGIS could be a possible software system for the demonstration application to be developed in. Road planning engineers at the Swedish National Road Administration are interviewed, ArcGIS is examined and guidelines concerning the routing plan, i.e. what kind of basic maps, line styles and symbols to use are establish in a iterative process.