Traffic congestion has become a severe scourge in highly densely populated towns in both developed and developing countries. Longer travel times, as well as a higher incidence of crushed vehicles, environmental issues, and deterioration in the quality of life, have been caused by increased demand for urban mobility and transit. Highway traffic congestion is often considered a routine occurrence; plan period accordingly. The study looks into the measure variables that influence travel time reliability (TTR). However, severe and unanticipated delays disrupted deliveries, program, and activity schedules, operations, and other logistics. In other words, the study looks into the potential factors that influence travel time reliability (TTR). This study used the Highway Capacity Manual (HCM) as a basis to assess the travel time reliability index. The study employed Log odd ratio to identify the relationship between the Buffer Time Index (BTI) and the planning time index (PTI) and determine the travel time-reliability threshold ratio, and the Planning Time Index (PTI) and also, determine the ratio of the travel time-reliability threshold. The study revealed the following: the diversion of 15%–20% of the total traffic from the high-level congested roads to the results of the least or lesser congested roads into a higher level of service (lower congestion), an increase in speed by 15km/h to 20km/h from the current speed levels, and increases by 10%–15%, respectively. The study indicates no relationship between traffic flow and travel time. The study also provides a better understanding of the system's capabilities, limitations, and data collection for real-time performance measurement