10,000 Vespas
 

Chianti and Gelato for everybody. More pics at the link.
http://blog.motorcycle.com/2014/06/1...as-looks-like/
http://blog.motorcycle.com/wp-conten...s-parade-f.jpg
http://blog.motorcycle.com/wp-conten...10-633x421.jpg

That's 10 Km, 6.21 miles of not 2 riders wide. That's 3 or 4 wide from the looks of the pics and vids. 32 countries were represented there in Italy.