I don’t have any Baht and rather than stand and queue to make an exchange, I try my luck with the conductor.  I offer her two dollar bills (which is more than 60 baht) and she gladly accepts and tucks them into her little purse.  The bus fills up and off we go.  Almost one hour and 45 minutes later (the traffic is horrendous, not just because it’s Bangkok but also because it’s the morning rush hour) I’m deposited - as Moovit says - right where I should be.