  We present the latest results of coherent $\rho$ (Coh$\rho$) production using
the large data set collected by the NOMAD detector in which the momenta,
charges, and photons are precisely measured. We discuss the application of
using Coh$\rho$ process to constrain the neutrino flux with the proposed
Long-Baseline Neutrino Experiment Near Detector, the high resolution Straw Tube
Tracker.
