Do limited stop services from Gateshead to Eldon Square have a set route or does the driver have the option to go either way (either via John Dobson Street or Blackett Street)

Also the same for non stop services from Newcastle to Metrocentre, are they free to go either via Askew Road West and Team Street or via Derwentwater Road and Clockmill Road, or do some routes officially go one way and some the other?