We are in XXI century, in 2017.
There are many public transports companies in Porto. They connect all the city and the suburbs – I think Gondomarense (this website is great) is one of the biggest in this sector.
Months ago, I send an email to this company, saying I could do my internship there, but they don’t answer me. Now I really understand why. They are well served.
When this company wants to communicate a change in a route, is how they do that.