This study presents a comprehensive preliminary design for stabilizing a cliff and mitigating rockfall hazards along the RN16 road at PK156+000 in Chefchaouen, Morocco. Conducted under, the research evaluates geological and geotechnical conditions, identifies unstable zones, and proposes multiple stabilization variants for four critical road segments. The proposed solutions include tunnels, false tunnels, rockfall nets with anchors, gabion walls, and reprofiling. Detailed geotechnical analyses, including fracture mapping and stability calculations using software like PHASE 2 and Roc Fall, informed the design process. Cost evaluations and variant comparisons highlight the most feasible solutions. This paper provides a robust framework for addressing rockfall risks in mountainous regions, ensuring road safety and infrastructure resilience. This paper presents a comprehensive analysis of slope stabilization strategies applied to a rockfall-prone cliff section along the RN16 road in the Chefchaouen Province of Morocco. The study area, located at PK156+000, suffers from significant instability issues, endangering the roadway. The investigation included a detailed geological and structural assessment, instability diagnostics, and the evaluation of several mitigation techniques. This paper discusses the geomorphological and geological characteristics of the cliff, summarizes the instability risks identified, and compares the effectiveness and costs of various stabilization solutions, including tunneling, faux tunnels, mesh systems, rockfall barriers, and slope reshaping. The findings provide valuable insights for similar rockfall mitigation projects in comparable geological settings.