In Reading  England  there is this thing called the IDR, short for "Inner 
Distribution Road", which is bureaucratese for "Big thing that cost a lot 
of money and relieves traffic problems, provided all your traffic wants to 
orbit the town centre permanently". It's a 2-3 lane dual carriageway that 
goes round the town centre. It has lots of roundabouts, an overhead 
section, a couple of spare motorway-like exits (that's British motorways -- 
y'know, the roundabout with the main road going under it), and a thing 
called the Watlington Street Gyratory, where you have to get in lane for 
your intended destination about three years and two corners before you get 
there *with no signposting*. I used to cycle along it every day to get to 
school, before I fell off at 35 mph.  Kids! Don't try this at home!   I 
know it well. I believe it is impossible to leave Reading heading west. 
        -- (Terry Pratchett, alt.fan.pratchett)