With the coming of dean moriarty began the part of my life you could call my life on the road. before that i’d often dreamed of going west to see the country, always vaguely planning and never taking off. what quality of the beat generation does kerouac express in this excerpt?

The quality of the beat generation that Kerouac expresses in this excerpt is a spirit of adventure.
You can see in this passage that he is talking about his 'life on the road' - meaning that he is always traveling and experiencing new things, which was a common thing for the beat generation of the 1960s. They wanted a change, both in their personal lives, and in the world.