ecurity 
      organizations, as well as other occupations where workers must walk
      long distances to carry out their duties.&nbsp; Segway models can zip
      along at speeds up to about 12 miles per hour.</li>

      <li href="http://www.razor.com/">Razor offers a line of economical electric scooters that are 
      designed for everyone from eight-year old children to adults.&nbsp; Some 
      models feature seats while others do not.&nbsp; Top speeds range from 
      about 10 mph to 15 mph, depend