Trimet tries to brag that they have 'frequent service' when the service is at 15 minute intervals. It's a phony because if one bus drops out that means riders have to wait a 1/2 hour for service, which in reality is infrequent service. Take the 57 bus below. The leader bus is over 30 minutes late and the follower bus is 15 minutes late. That means there has been no bus for 45 minutes. Trimet FAIL!