Low volume roads (LVR), commonly unpaved or gravel roads, are crucial for rural connectivity but often suffer from reduced service life when constructed on weak subgrade soils, particularly silty clay. Silty clay soils have low permeability, and excess water in the subgrade can further weaken its strength and bearing capacity, leading to quicker pavement failure. Due to limitations in traditional subgrade soil stabilization materials, researchers are exploring innovative alternatives with plastic waste emerging as a promising option in recent years. A significant contributor to plastic waste is Acrylonitrile Butadiene Styrene (ABS) plastic, commonly used in 3D printer filaments, electronic casings, and a wide range of other applications. This study investigates the potential of a two-pronged approach to address these challenges: utilizing ABS plastic waste filaments and Terrasil solution, a nanotechnology-based soil stabilizer. ABS plastic waste from 3D printing filaments was incorporated into the silty clay soil at various weight percentages (1%, 2%, 3% and 5%) with filament pieces measuring 1.75 mm in diameter and cut into lengths of 1.0 cm and 2.0 cm. Additionally, 0.1% Terrasil solution was sprayed on compacted soil specimens to simulate the waterproofing effect and enhance drainage characteristics. To evaluate the potential of ABS plastic filaments and Terrasil to enhance the performance of LVR subgrades, this study examines key properties including compaction, California Bearing Ratio (CBR), and Unconfined Compressive Strength (UCS) on unreinforced and reinforced soil specimens. The results indicated a significant improvement in the CBR values with the inclusion of 3D printing waste filaments. In addition, while using ABS plastic waste filaments and Terrasil solution in low-volume road design, the pavement thickness is significantly reduced, according to Indian Roads Congress SP:72–2015 guidelines.