WayChains analysis worldwide:

int_ref/ref values on highway=motorways:

All paired refs map

All refs

Totals:

1461 paired out of 3833 different ref values (38%)

31921 ways with no ref

Generated 2010-10-17T22:59:29+01:00 from file /home/harrywood/public_html/waychains/us-motorways-simplified.osm