This paper presents an object based Geographical Information Systems for Transportation (GIS-T) data model for road maintenance in Uganda. It is a result of a PhD undertaking whose main objective was to develop a framework within which the use of Geographic Information Technologies could be enhanced as decision support tools for road infrastructure maintenance in Uganda. The model is based on data requirements of the road maintenance sector and is a means towards establishing standards for geographical datasets. This was accomplished through identification of road maintenance data requirements, review of organisational reports, workshop proceedings, organisational terms of reference for various projects, understanding and consideration of the Information Quality Levels (IQL) and a review of existing data models and standards in transportation. The presented conceptual and logical data models for road maintenance are based on concepts of dynamic segmentation (dynseg) and linear referencing. Essential to adoption of the proposed model is the understanding of the transportation network of the country. The underlying requirement for implementation of the model is the choice of GIS software with the full set of dynseg tools. Key words: GIS-T, Data model, Road maintenance, dynamic segmentation, Linear referencing, Uganda