If you're looking to download these for free (often under Creative Commons or royalty-free licenses), check out these top sound libraries:

A simple site with clean, easy-to-download transportation effects. Pro-Tip for Creators

Looking for that classic screech and hiss of a bus pulling up? Whether you're working on a video, a game, or just need a sound effect for a project, "bus brake sounds" usually involve a mix of high-pitched friction and pneumatic air releases. What Makes That Sound?