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Blocking the tube as well will mean that someone has to take some notice
Do you lay tacks for people commuting by bike. Means they'll take notice rather than just appreciating the empty roads.
(/facetious)Blocking the busiest roads is visible and disruptive. Highlights how much more pleasant an area is without incessant traffic and pollution. Public transport is counter intuitive for me.
Surely this protest is about bringing the city to a standstill to try and force government to take action. Blocking the tube isn't about encouraging certain types of transport, it's about causing as much nonviolent chaos as possible in order get a reaction. The current blocks while great would have zero impact on the majority of commuters. Blocking the tube as well will mean that someone has to take some notice