(03 Jul 2021, 1:10 pm)big mac wrote How about extending the 4 to Newcastle?
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What would be the point?
The core frequency of the service is every 12 minutes. If extended to Newcastle, it would most likely follow the route of the 27, which has a core frequency of every 15 minutes. To accommodate the former, it is most likely the latter would be withdrawn as people can easily change buses at Heworth onto the most direct route, or alternatively use one of the more indirect routes into Newcastle, or the Metro.
Plus there is the issue of reliability to consider. I don't know how reliable the 4 is, but you can guarantee it is bound to be less reliable if extended to Newcastle.