At left, indoor storage ensures Segways will operate in all seasons.

Named to sound like the word “segue,” Segways are two-wheeled, self-balancing electric vehicles.

The patented vehicles were introduced in 2001 by Dean Kamen, an American entrepreneur and inventor. They were first offered for sale in 2002.

With computer technology hermetically sealed under the rider's feet, Segways are propelled as users shift their weight forward and backward. Movable handlebars direct them from right to left.

Personal transport Segways are designed for street use or off-road travel, distinguished primarily by tire size. Weighing between 105 and 120 pounds, they travel up to 12.5 miles per hour.

According to Bruce Knight, manager of Segway of Western PA in Foxburg, new Segways cost between $6,000 and $7,000. Although Segways use minimal electricity, their two batteries must be replaced after about 1,000 charges — roughly every three to four years. Cost to replace both batteries averages $2,000.

The vehicles travel 12 to 15 miles on a single charge, which takes a kilowatt of electricity. A dead battery takes eight hours to charge.Segways designed for off-road travel, called X2s, can maneuver in 2 to 3 inches of snow and perform at 14 degrees if stored in temperatures above 50 degrees, Knight said.According to Pennsylvania state laws, i2 Segways can legally travel on sidewalks and in streets, but not limited access highways.The vehicles are designed for riders between 100 and 260 pounds and are governed by bicycle helmet laws.In early 2010, Kamen sold Segway Inc. to British entrepreneur James Heselden, who died the same year after falling from a cliff while riding one of the vehicles.Despite that accident, enthusiasts say the vehicles are safe. Knight said since opening in 2008, his company has taken more than 3,000 clients on guided tours, which resulted in no injuries.

Computers sealed into the platform are protected from rain and snow.