First, a pristine, clean, out-of-the-census sattellite view:
Second, a roadgeeky look at the major roads of the Lehigh Valley.
M=Motorway, compare to Interstates or British Motorways
N=National Road, compare to US routes or British A roads
Post Roads, compare to State Roads
c=Connectors. c40 connects to M40, for example
(you kind of have to, to read the labels )
Thanks for coming!