By the time the buses have reached the San Salvador historic downtown they will have already transported 20,000 passengers. SITRAMSS is a public-private partnership involving the current passenger transport operators, who must purchase the buses. To pay for the infrastructure development, a loan of $50 million has been provided by the Inter-American Development Bank (BID). The system will work with a prepaid card system which is expected to reduce the time required for passengers to enter the busses. An estimated 200,000 passengers will be transported daily, or about 5,600,000 every month.