We always recommend checking with the Colorado Department of Transportation ( www.cotrip.org ) when planning your road trip in Colorado as road...
Aspen Foliage
Quaking Aspen
Aspen are remarkable and unique trees. In fact they are so different that it may be better not to think of aspens as trees. First of all, a stand of aspen is really only one huge organism where the main life force is underground. Think of aspens as large 1-20 acre systems of roots that remain hidden underground until there's enough sunlight. (source: http://www.nps.gov/)