Public transport routes and timetables in citys are determined through a collaborative effort between local transport authorities and public transport companies. Local authorities are responsible for identifying transportation needs in the community and working with transport companies to establish adequate routes and schedules.

When determining routes, factors such as population density, existing infrastructure, and access to key locations such as schools, hospitals, and business centers are considered. Public transport companies may also conduct surveys and collect data to determine the most efficient routes and schedules. Once routes are established, timetables are developed based on factors such as expected demand, frequency of service, and local regulations. Timetables are subject to change due to factors such as construction, traffic, and changes in demand.

How exactly is this process organized in your country (city)? What are the laws governing this process? Maybe there are review articles on the subject?