"Only a train would think that's a cool city layout" says commenter The crown prince of Saudi Arabia Mohammed bin Salman has unveiled plans for a 100-mile belt of zero-energy communities for a million people. Residents would live within a five-minute walk of essential facilities and the city would have no cars or streets. "This is a terrible idea" Readers aren't sold. "Imagine if your relatives live on the other end," said Stefanos S. "Silly idea." "Only a train would think that's a cool city layout," added Zea Newland. "The idiotic idea of linear cities comes up probably every decade – it needs to be reiterated that this is a terrible idea," continued Gudjon Thor Erlendsson. "The transport length is extremely inefficient and this can be proven with simple modelling or mathematics. It looks cool from 10,000 feet up but it's all form, no function."