The rapid growth of transportation infrastructure has increased the demand for sustainable pavement materials and environmentally friendly construction practices. The disposal of waste tyres has become a major environmental concern due to their non-biodegradable nature and increasing accumulation in landfills. This research investigates the application of waste tyre reinforced subgrade materials in sustainable highway pavement design. The study focuses on improving subgrade strength, load-bearing capacity, and pavement performance through the use of waste tyre rubber as reinforcement. Laboratory tests such as Atterberg limits, compaction test, California Bearing Ratio (CBR), plate load test, and settlement analysis were conducted to evaluate the performance of reinforced subgrade soil. The results indicate that the inclusion of waste tyre materials significantly improves subgrade strength, reduces settlement, and enhances pavement durability. Sustainable pavement design using waste tyre reinforcement also reduces construction cost and environmental pollution. The study concludes that waste tyre reinforced subgrade materials can be effectively used in highway pavement construction to promote sustainable infrastructure development and waste management.