"Casual Carpooling" at least used to be popular - you can read about it here: http://sfcasualcarpool.com/ http://sfcasualcarpool.com/ Originally, for the East

"Casual Carpooling" at least used to be popular - you can read about it here: http://sfcasualcarpool.com/ http://sfcasualcarpool.com/ Originally, for the East Bay to San Francisco trips, cash would not exchange hands because the Bay Bridge toll was waived for carpools. Now that the carpool toll is $2.50, my understanding is that it's a little more awkward.