Dissertation (MA Business Administration)Delays and Cost overruns in roads construction projects have immense effects and their determinants have been a matter of debate. The aim of this study was to investigate the determinants of delays and costs overruns in roads construction in Tanzania. The specific objectives were to examine the factors for delays, cost over runs and explore possible measures to address the formers. The study used a triangulation of approaches where case study and cross sectional design were employed. A total of 52 respondents were systematically sampled to get data on the problem. Data collection was done through interview with an aid of structured questionnaires .The pre testing of tools before data collection. The results were analysed in SPSS 15 and figures drawn using Excel. The study found out that, delays in road projects was not a natural calamity but due to poor planning, evaluation and implementations. On the other hand, costs overruns was due to corruption, failure to carry out feasibility study, weak team leaders and using historical prices in budgeting. It is therefore recommended that serious initiatives such as suing those who engage in corruption, conducting feasibility study and strengthening the payment system and tendering process should be taken into account to reduce delays and costs over runs.