1951 Vespa Siluro
In 1951, Vespa set off to challenge the most prestigious speed trial: that of the standing kilometer. On February 9, between the 10th and 11th kilometer on the Rome-Ostia motorway, a Vespa with two horizontally opposed pistons designed by Corradino D´Ascanio and driven by the test-driver Dino Mazzoncini, beat all standing kilometer records with a time of 21.4 seconds and an average speed of 171.1 km/h (106.3 mph). [Image/Text Credit: Piaggio]