New Tool From National Laboratory of the Rockies Draws on Long-Term Demographic Data To Simulate Population Evolution Over Time DEMOS captures the “continuum of life” by considering a range of household- and individual-level life-cycle events. Graphic by Shivam Sharda, National Laboratory of the Rockies Many personal transportation-related decisions—such as vehicle purchases—are influenced by life events, like the birth of a child or a change in employment.