Maximum allowed travelling distance to TAC

I should know the answer to this , but have a mental block :(

What is the maximum permissable distance to travel to a TAC , before it becomes mandatory to join one 'closer' as it were?
161 for me! again not questioned, cos what I do few people want to, same as most of the team our PTI beats me, for distance travelled I hasten to had, North of Inverness to RTC!

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