Indo_HCMSDP: An open-source package for signal control design using Indo-HCM guidelines

US-Highway Capacity Manual and Webster method remains the most popular methods for performance assessment of signalized intersection for homogenous traffic conditions. Owing to the limited scope of the abovementioned methodologies for Indian mixed traffic conditions, the Indian Highway Capacity Manual (Indo-HCM) lays guidelines for the performance assessment of isolated fixed-time signalized intersections. The manual, however, does not include a design framework for signalized intersections. Furthermore, the current state-of-the-art IRC: 93-1985-based signal control design has applicability constrained to undersaturated intersections. Based on the recommendations of Indo-HCM and IRC: 93-1985, this study aims to explore three popular algorithms named n-D Grid Search Algorithm, L-BFGS-B and QSP to estimate the optimum signal phase plan. The study aims to develop an open-source python package, “Indo_HCMSDP”, to assist practitioners with signal design applications. The package contains three signal design tools, namely Indo_HCMSDT_I, Indo_HCMSDT_II and Indo_HCMSDT_Adv. Using a case study of two closely spaced intersections in Surat city, the study highlights the applications and limitations of the three aforementioned tools.