Cars, roads, and parking have bumped up against hard limits. There's no way to expand a lane of traffic to more than 2000 cars per hour and people generally res

Cars, roads, and parking have bumped up against hard limits. There's no way to expand a lane of traffic to more than 2000 cars per hour and people generally resist multipliers like buses and subways unless driving is already painful. Broadband has expanded several orders of magnitude. There's still the ransition from copper to fiber, from 1G to 10G, and multiple wavelengths.