Despite many rural roads being in a terrible state, Kenya Rural Road Authority is authorized to control their construction, repair and maintenance and the government has spent considerably to guarantee it has competent people certified in their field of operations.  The goal of the research was to investigate the institutional elements impacting sustainability of KERRA (Kenya Rural Road Authority) projects in Nyeri County, Kenya. The research aimed to determine what factors such as resource availability and human resource efficiency on the long-term viability of KERRA initiatives. The research was conducted using a descriptive survey method that used both qualitative and quantitative techniques. Forty respondents were selected using stratified random sampling from a target of 45. Questionnaires were the major means of information gathering besides interview schedule. Quantitative data was examined using statistical approaches such frequency distribution, percentage, and mean. The data was analyzed using SPSS 25.0. From the regression findings, the study revealed that there existed a significant positive relationship between human resource efficiency and sustainability of rural road projects as indicated by β=.635, p=0.03<0.05, t=8.347. Resource availability has a significance positive influence on sustainability of rural road projects (β= 0.433, p = 0.01<0.05, t=7.882). The study recommends that the management should eliminate human resource efficiency in all its processes to allow for faster decision making in approval, disbursement, procurement and supervision. Management should allocate adequate financial resources, promote timely disbursement and enhance procurement to ensure all resources required for project implementation are provided just in time