Why should Bay seniors care that the 100th anniversary of SF’s Muni is this Friday? Because from 5am on Friday until 5am on Saturday anyone can ride for free. That includes cable cars which are normally $5. By the way were you aware that seniors get discounts on cable car rides all year long –as long as we’re riding them from 9pm to 7am- for just $1. It’s news to me that they run from 6am to1am daily.