This article has the purpose to analyze, based on the current technology, the factors that have been implemented in HUD systems, with the purpose to establish which its functions are and which are the advantages and disadvantages of these systems, in order to compare their relevance at the moment the system is implemented in an automobile. To fulfill this objective an optical and perception analysis was proposed through an instrumental set up, with common characteristics to any automobile, making possible the implementation of a large amount of theoretical and practical considerations. Finally, some recommendations, considerations and conclusions were made, all focused in a proposal of the way that that these systems can be approached.