Original sentence: Computers and motors in the base keep the Segway upright at all times.Segways are driven by quiet, non-polluting electic motors at up to 4 times walking speed.The Segway is the world's first self-balancing transportation device.Users lean forward to move forward, and back to move backwards
Edited sentence: And they do all this without the rider ever breaking a sweat -- which means they can be used by the broadest possible cross section of the population, including the elderly and infirm.From an urban perspective, Segways offer a number of advantages: They are quiet.Not the other way around.Segways are often talked about and thought of as a form of scooter.The Segway is the world's first intuitively driven, self-balancing transportation device.There is no exhaust pipe spewing pollution.There is no gas or brake pedal.These devices can help our older residents move around with an ease and dignity that would otherwise be unimaginable.They are not electric scooters and have nothing to do with scooters.They can operate at 4 times walking speed.They take up almost no space.To move forward you simply lean forward.To slow down or stop you lean back.You stand on the machine and it balances itself to you