Rapporto d'aspetto: differenze tra le versioni

}}</ref><ref name="Kühn2013">{{cite book|last=Kühn|first=Wolfgang|title=Fundamentals of Road Design|url=http://books.google.com/books?id=pdikFUh4tmsC&pg=PA24|accessdate=9 November 2014|year=2013|publisher=WIT Press|isbn=978-1-84564-097-2|page=24}}</ref>

 

 

== Standard televisivi ==