3 ms·

At high velocities (> 40 km/h?) the main drag comes from aerodynamics (turbulence, air viscosity…), not rolling resistance.

• rb808 8y ago
  perhaps with autonomous cars and rails the cars can follow each other very closely so improves aerodynamics too.
  • dest 8y ago
    indeed
  • dx034 8y ago
    They already trialed that with trucks where several trucks form a convoy, controlled from the first one. Saves ~30% fuel for the following trucks. That could be used flexibly and probably contain 5-6 trucks minimum without disturbing traffic.