As part of the activities for Bangkok Car Free Day on Sunday 21 September 2014, you can ride the BTS Skytrain, MRT Subway, ARL City Line, and buses and boats across the city for free. All you have to do is buy the special badge for 50 Baht. Money raised will go to the Chai Pattana Foundation. From 10 September you can buy the badge at every branch of Kiatnakin Bank and the information desk at Seacon Bang Khae and Seacon Srinakarin. From 12 September you can buy at Central World and Terminal 21. On the actual day, there will will be several bike activities in Bangkok. This includes a cycle ride from Sanam Luang to Bangkok’s business district and cycling activities on Silom Road which will be closed to cars. I will post more information about this soon.