Ask HN: A public transport service that adapts your context

As I’m a guy that is a lot in public transport, I’m always wondering if there exists a service that at every station checks if this is the most preferred travel journey, especially with an eye on disruptions, and gives an alternative journey if needed. Nowadays, if I’m in a disruption I need to plan my whole journey again.

Why isn’t there something like the car functionality in Google Maps which redirects you in case of a traffic-jam?