Selected CivV0 lines (lines separating adjacent regions of strong blue shift and strong red shift) located near the solar limb and oriented parallel to the radius vector from disk center are shown to be closely aligned with Hα dark filaments in active regions. The filaments, in turn, are known to lie in the vicinity of magnetic neutral lines. The radial orientation of the V0 lines minimizes uncertainties in image registration and their location near the limb ensures that the observed fluid motion has major components paralleling V0. It follows that the filaments are located at sites of velocity shear, and, by inference, of magnetic shear. For a case in which a given V0 line is observed near both east and west limbs, the gradient of Doppler velocity across the V0 line reverses sign from one limb to the other as is expected for horizontal steady flow. Thus, the velocity vectors remain fixed with respect to the filament.