Disruption is Normal

What's wrong with this map? nothing, until you look at the legend:

'Disrupted lines appear in their normal colour'

Not sure whether that's

a)an illogical bit of Tufte-baiting undesign

b) sad, resigned pragmatism on the part of some put-upon designer at Transport For London

c) just the truth

I'm glad I walk to work

no doubt I'll get some ridiculous cease and desist for publishing this picture