How did the invention of the motorcycle changes people lives?

The invention of the motorcycle lead to the invention of the automobile. Making life easier. The motorcycle enigine is the same engine the first used in earliest making of the first automobiles. They even used milk as a test run instead of gasoline. Some people still believe that milk can be a alternative to gasoline due to some successful test runs. The motorcycle is very important in our history. However on the downside it also causes more than 50% of the worlds deaths each year.