A TfL spokesman claims it's easy enough for passengers to rethink their journeys to avoid the Northern Line during rush hour:
"For example, if you get the Tube at Clapham North to Stockwell just to transfer to the Victoria Line maybe you could instead walk as it would only take 10 minutes.
"Or could you start your journey 10 minutes earlier to avoid the crowds?"
More top news
Before the final declaration on Friday, the Conservative candidate looked set to lose the City Hall race to Labour's Sadiq Khan.
The Tooting MP has been the frontrunner in the counting process ahead of Tory challenger Zac Goldsmith.
It's not just London where elections have been taking place today. There were council elections taking place across the home counties.