This paper presents the results of a laboratory study on how effectively the plastic waste could be utilized in bituminous concrete course to improve the properties of bituminous mixture. It has been shows that the addition of plastic waste flakes results in the improved Marshall Stabilities and flow value. The OBC for plain bitumen mixture was 5.33, while for plastic blended bituminous mixture for (i.e., bitumen+ plastic) 80%+20%, 60%+40% and 40%+60% was 6.67, 6.00 and 5.50 respectively. For all mix maximum stability, minimum flow, mean air voids and mean voids filled with bitumen were determined. It was observed that 80% Bitumen+20% Plastic blended mixture has shown very good increased stability value of 48% increase when compared to reference bitumen mixture. The overall result shows that, Marshall Stability value has increased with bitumen mixture modified with plastic waste and the flow value has decreased.