Its pretty easy to add a spare seat to the bike, or better yet a passenger cart. In the US laws very from state to state. In Wisconsin as long as the bike is under 80cc it's not considered a motor vehicle. So I can ride it pretty much anywhere, and don't necessarily have to follow the speed limit.
I actually find it to be less dangerous than a car. I have been involved in a few bad car accidents, including a hit and run that I was lucky to walk away from. The bike is easier to maneuver in and out of traffic, and faster from point A to point B in the city. If I come up on a line of cars, I just go around them. I get to my job in around 6-7 minutes a day, by car it would take me 10 min. For bigger cities where a lot of people use ride share or Uber to get to work, or take taxis, this would be cost effective solution.