What are the requirements for the velodrome?

Could you please elaborate on the necessary requirements for constructing and operating a velodrome? Are there any specific standards or regulations that must be met in terms of the track's dimensions, surface material, or safety features? Additionally, what kind of infrastructure and facilities are typically required to support a velodrome, such as locker rooms, spectator seating, and lighting? How does the location of the velodrome affect its design and operational requirements? Finally, are there any financial or operational considerations that must be taken into account when planning to build and operate a velodrome?