Public transportation infrastructure projects are usually funded by the government, but now they are looking for other ways to get money because of financial problems. Public private partnerships (PPPs) are becoming more popular for funding these projects. PPPs combine the government's responsibility to build transportation infrastructure with the private sector's innovation and money. However, PPPs can make things more expensive because of complex contracts and the need for profits. Some places are trying to do more of the work themselves to save money and make the infrastructure better. Overall, PPPs can be a good way to fund public transportation projects and are likely to be used more in the future.