Some people are trying to be cute about car pool lanes. A pregnant woman tried to argue her way out of a $367.00 ticket, claiming there were two people in the car; she was not successful.
The purpose of a carpool lane is to reduce traffic and the environmental burden of automobiles. A carpool accomplishes this by encouraging drivers to share rides. It doesn't count if you're pregnant. It doesn't count if you have a car full of kids. If they can't drive, you're not conserving anything.
Don't be a dick.