Traffic in Indonesia is heterogeneous, with various types of vehicles often disregarding lane-discipline regulations. This diversity contributes to varying operational speeds across vehicle types, influenced by regional characteristics, socio-economic factors, and cultural norms. Additionally, land use is predicted to impact speed distribution and patterns. This study aimed to examine speed dynamics on multi-lane one-way roads within Semarang’s commercial zones. Specifically, it analyzed speed heterogeneity among motorcycles (MC), light vehicles (LV), and heavy vehicles (HV) using speed and density data collected from MT Haryono Street, a two-lane, one-way road situated in a commercial area near Semarang’s central business district (CBD). Findings revealed that as highway density increased, indicating greater traffic volume, vehicles had fewer options in selecting speeds, often resulting in speeds below 5 km/h at a density of approximately 2000 pcu/km. Moreover, the analysis highlighted differences in speed selection opportunities among MCs, LVs, and HVs, with HVs exhibiting the lowest flexibility compared to MCs and LVs.