The main stimulus for the design style of the Vespa dates back to Pre-WWII Cushman scooters made in Nebraska, USA. These olive green scooters were in Italy in large numbers, ordered originally by Washington as field transport for the Paratroops and Marines. The US military had used them to get around Nazi defence tactics of destroying roads and bridges in the Dolomites (a section of the Alps) and the Austrian border areas.
Aeronautical engineer Corradino D'Ascanio, responsible for the design and construction of the first modern helicopter by Agusta, was given the job of designing a simple, robust and affordable vehicle for Enrico Piaggio. The vehicle had to be easy to drive for both men and women, be able to carry a passenger, and not get its driver's clothes dirty.