Travel time reliability consideration is getting increased attention to travelers and transportation professionals as non-recurring congestion is a crucial component of trip making. Considering its importance, travel time reliability is reflected as a performance measure, included in transportation planning process, and encompassed in the economic analysis of future investments. This paper examines how planning agencies can incorporate reliability in their planning and decision making framework. A unified framework is proposed to make use of the limited available data to estimate value of travel time reliability (VoTR). In the framework reliability ratio is estimated as a travel time variability using one year of travel time data from various origin destination pairs. Further the reliability measure is incorporated in a mode choice model to estimate VoTR. To estimate VoTR savings from the recent and future transportation network investment the framework is applied in the statewide transportation model in the state of Maryland. The results show savings from travel time reliability has a major contribution to the justification of network improvements. The proposed approach can be used as a tool to (1) provide a systematic approach to estimate travel time reliability for planning agencies, (2) incorporate travel time reliability in transportation planning models, and (3) evaluate reliability improvements gained from transportation network investments.