[ppml] IPv4 wind-down

[michael.dillon at bt.com]

> >> Horse and buggies are not permitted on freeways, at least not
> >> in the United States. 

> >but you can't drive that on a freeway. And you can't drive a 
> Segway on
> >the freeway either.

> Actually you can ride bicycles on US highways, at least in some states
> (maybe all of them?) definitely in the state I'm in.

You can take a horse and buggy on US highways as well, but not on the
freeway.
You see it all the time in Pennsylvania's Lancaster county.