They are all manufacturers of motorcycles.

Harley - Harley-Davidson, a US company.

Kawasaki - Kawasaki Motorcycle Corporation, a Japanese company.

Ducati - Ducati Motor Holding S.p.A.

is an Italian company.

Ducati 1199 Panigale S

In 1926, three brothers Adriano, Marcello and Bruno Ducati founded 'Societa Scientifica Radio Brevetti Ducati' in Bologna, making radio parts etc. This went well until the 2nd World War After the WWII Ducati began making small engines to fit to Bicycles, and that led to their first complete motor bike, in the 1950's legendary designer Fabio Taglioni joined Ducati, and the rest is just history.

You should be able to find the answer among one of the thirty-two definitions for ADR at http://www.abbreviations.com/bs.aspx?st=ADR&SE=1&o=p&p=1&filter=&adults=y. However, if it isn't listed, check out this site with 86 abbreviations for ADR and over 250 acronyms: http://www.acronymfinder.com/af-query.asp?Acronym=ADR&Find=find&string=exact.

DUCATI