Can you guess what it is?

If you guessed price, then you're right. The March 2009 Muni Fast Pass (a calming mix of sea green and sky blue) is missing its $45 tag. Why? Well, according to SFMTA spokesperson Judson True, it's part of a tiny fare increase. "Last year as part of a 2-year budget our Board of Directors approved a Fast Pass increase from $45 to $55 beginning July 1, 2009," he tells SFist. "Discount passes (Senior, Youth, Disabled) will go from $10 to $15." Muni will be doing "extensive public information outreach" in the coming months.

Now you know.

(Thanks, Chris Iverson, for sending this our way.)