  We apply a recently-developed coarse-grained model of DNA, designed to
capture the basic physics of nanotechnological DNA systems, to the study of a
`burnt-bridges' DNA motor consisting of a single-stranded cargo that steps
processively along a track of single-stranded stators. We demonstrate that the
model is able to simulate such a system, and investigate the sensitivity of the
stepping process to the spatial separation of stators, finding that an
increased distance can suppress successful steps due to the build up of
unfavourable tension. The mechanism of suppression suggests that varying the
distance between stators could be used as a method for improving
signal-to-noise ratios for motors that are required to make a decision at a
junction of stators.
