I live in RB and work in UTC. I can get from my house to my job using public transportation (one bus connection, 20->31, if i remember correctly). There are bus stops next to my house and next to the office where I work.
There’s just one problem. The same trip that takes me 20 min with my car (25 in rush hour) takes 1 hour 50 min with the bus. That includes 20 min wait on a bus stop somewhere in Mira Mesa.
Oh and the bus ticket ($2.25 last i checked) costs more than gasoline burned by my relatively fuel inefficient car during 15-mile trip.