A non-lethal energy absorbing vehicle barrier for decelerating an impacting vehicle includes a first gate member and a second gate member disposed downstream of the first gate member. An etching composition is also provided for such a manufacturing method. The rotary tool and the screed apparatus may comprise a closed loop control system. Advantages of embodiments of the titanium boronitride include reduced scratching, increased hardness, finer granularity, thermal stability, good adhesion, and low bulk resistivity. A manufactured unit can then be evaluated using a mathematical combination of the adjusted results. The first part has a length extension L1 and the second part has a length extension L2 where L2L1\u22670.