  We introduce a modified version of P. Jones's $\beta$-numbers for Carnot
groups which we call {\it stratified $\beta$-numbers}. We show that an analogue
of Jones's traveling salesman theorem on 1-rectifiability of sets holds for any
Carnot group if we replace previous notions of $\beta$-numbers in Carnot groups
with stratified $\beta$-numbers. As we generalize both directions of the
traveling salesman theorem, we get a characterization of subsets of Carnot
groups that lie on finite length rectifiable curves. Our proof expands upon
previous analysis of the Hebisch-Sikora norm for Carnot groups. In particular,
we find new estimates on the drift between almost parallel line segments that
take advantage of the stratified $\beta$'s and also develop a Taylor expansion
technique of the norm. We also give an example of a Carnot group for which a
traveling salesman theorem based on the unmodified $\beta$-numbers must exhibit
a gap between the necessary and sufficient directions.
