This study covers the graphical analysis of deformation values measured in the Kizlac T3A tunnel (Osmamye, Turkey), which was built as a part of the Tarsus-Adana-Gaziantep Motorway Project. Excavation was performed through a sequence which was composed of sandstone-shale alternation, sandstone and dolerite dyke. Horizontal, longitudinal and settlement deformation values were optically read and recorded daily on a computer. These data were evaluated according to New Austrian Tunneling Method. Total deformation measurement, risky area determination and forecast of transitions between weak and stiff rock, stiff and weak rock were assessed as a result of deformation evaluation for tunnel stability, safety and economy.