American rail doesn't exist outside of like two cities. To take public transit to work, I'd have to walk about 12km to the train station. From there, I could catch a train that runs every hour to downtown. I think that train takes about 45m, but I have no idea how often it runs. From downtown, I could transfer to light rail for 20m, transfer again to a bus for 15m, and then I could walk the last 6 blocks or so. Not counting the 12km walk, it would take at least 1:20 plus time spent waiting on transfers.
Or I could drive there in 45m of horrible traffic.