Read the authors other article: https://www.citylab.com/transportation/2017/12/what-elon-musk-doesnt-get-about-urban-transit/548843/ https://www.citylab.com/tra

Read the authors other article: https://www.citylab.com/transportation/2017/12/what-elon-musk-doesnt-get-about-urban-transit/548843/ https://www.citylab.com/transportation/2017/12/what-elon-mus... He makes the argument the reason that doesn't work is geometry and utilisation of limited city space.