I have ridden one on a fairly regular bases for a number of years. Carry it in my semi's sleeper when on the road as well.
Ive certainly ridden it often way past 20 miles. People in UK and Europe have been known to tour with them.
Go to the Brompton web site and see where the dealers for US are and learn a little bit about them at same time.





^^^^^^^nice Moulton^^^^^^^^^