Multiplexed photonic Doppler velocimetry is required to measure 2D surface velocities of novel materials in shock physics experiments. Very close measurements lead to crosstalk issues, which can be fixed by wavelength multiplexing. The benefits of our 16 wavelengths photonic Doppler velocimetry system over conventional systems are demonstrated here. First, a dedicated crosstalk comparative experiment has been carried out using a high-pulsed-power generator at about 80 m/s. Second, velocity uncertainties are discussed with 16 wavelengths measuring the same point in an experiment at 130 m/s.