Abstract: This study will highlight a recommendation that should be investigated, including design interface which will help in getting a granular filter layer above the subgrade in the pavement structure that might have a huge influence on road maintenance costs owing to the subgrade layer's fragility. It will also provide the Ministry of Work with a new suggested practical pavement to cure the internal instability or weakness of the present subgrade layer, as well as effectively channel expenditure to its economy. The influence of using a filter layer on numerous subgrade features, on the other hand, will be explored. Filter aggregates are composed of sand, gravel, or crushed rock. Aggregates manufactured which can have high impact in preventing both piping due to fine migration of subgrade particles and permeability to prevent water accumulating below the pavement layers which will affect the stability of pavement structure and cause several problems for it. Subgrade assessment should be done prior to using filter layer . The decision should be taken whether the existing subgrade is considered as suitable or unsuitable material based on several properties. Based on the assessment the engineer can perform 2 main tests which are the sieve analysis, and the plasticity index results which can be used as an input in the designed interface to get the filter gradation curves. The newly developed computer interface can be used as a website file designed by a written code can be opened and used anytime using computer browser with internet connect. The user will use the tests previously stated to get the subgrade curve graph. Then, an inspection of the subgrade curve should be done by the user