Transport for Los Angeles, US
Data about positions of Metro vehicles in real time and travel their routes
TfGM transport network data.
Transport for Manchester, England API is a free Transportation API that requires apiKey authentication, is served over HTTPS and does not support CORS, so it should be called from a server.

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Data about positions of Metro vehicles in real time and travel their routes
Data about buses routes, parking and traffic
Yes. The Transport for Manchester, England API is listed in the Transportation category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The Transport for Manchester, England API uses apiKey authentication, so you need to register for credentials before making requests.
Not directly. The Transport for Manchester, England API does not allow CORS, so call it from a server, serverless function or proxy instead of front-end JavaScript.
Yes. The Transport for Manchester, England API is served over HTTPS, so it's safe to use in production.