Official Bus Schedule for Costa Rica

Does anyone know where the Official Bus Schedule for Public Busses in Costa Rica is? A million sites list bus schedules but they’re all different (and mostly wrong).

I understand the busses don’t run on time. But there isn’t any reason for me to be at the bus stop at 11:30 if the bus isn’t until 12:30 (especially if it’s going to be late), it’s certainly not going to leave early.

Also see these (similar) items:

• Taking the Bus in Costa Rica
• Riding the Bus
• Interbus – “Really Good”
• I was waiting for the bus in Montezuma.
• Getting My Driver’s License in Costa Rica