Reply to comment on “On the controversy around Daganzo's requiem for and Aw-Rascle's resurrection of second-order traffic flow models” by H.M. ZhangD. HelbingEur. Phys. J. B, 69 4 (2009) 569-570DOI: https://doi.org/10.1140/epjb/e2009-00193-4