A spokesman from the website Commuting Expert said that while he understood that overcrowding is a real problem and it takes time to build up capacity, it's still a frustrating issue for commuters:
"Transportcosts are going up and up while salaries stay flat - so it is frustrating whenthe service you're paying for isn't the service you're being recommended touse,"
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Official readings are recorded three metres in the air but a study found levels of nitrogen dioxide (NO2) were higher at pushchair level.
Tubes, trains, trams, buses, cable cars, river buses, taxis and going by foot - your guide to getting around during the strike.
Union officials rejected a revised offer from Underground managers during a meeting at the conciliation service ACAS this afternoon.