I know there is no definition of how "regular" a service has to be to define a shortest route.
But in practice, what are the least regular services that actually DO set shortest routes?
And does anyone have a preferred route which would become Permitted if an unusably infrequent service were withdrawn?
But in practice, what are the least regular services that actually DO set shortest routes?
And does anyone have a preferred route which would become Permitted if an unusably infrequent service were withdrawn?