Specifications include, but are not limited to: All TAU II Impact Attenuators repair and replacement parts are manufactured by Barrier Systems by Lindsay Transportation.. Impact Attenuator TAU-II, 4 Bay 44 mph/70 km/h, Portable Barrier Backstop . Impact Attenuator TAU-II, 8 Bay 62 mph/100 km/h, Portable Barrier Backstop . Impact Attenuator TAU-II, 4 Bay 44 mph/70 km/h, Compact Backstop . Impact Attenuator TAU-II, 8 Bay 62 mph/100 km/h, Compact Backstop . Impact Attenuator TAU-II, 4 Bay 44 mph/70 km/h, Flushmount Backstop . Impact Attenuator TAU-II, 8 Bay 62 mph/100 km/h, Flushmount Backstop . Impact Attenuator TAU-II, 4 Bay 44 mph/70 km/h, Portable Barrier Backstop . Impact Attenuator TAU-II, 8 Bay 62 mph/100 km/h, Portable Barrier Backstop . Impact Attenuator TAU-II, 4 Bay 44 mph/70 km/h, Compact Backstop . Impact Attenuator TAU-II, 8 Bay 62 mph/100 km/h, Compact Backstop . Impact Attenuator TAU-II, 4 Bay 44 mph/70 km/h, Flushmount Backstop . Impact Attenuator TAU-II, 8 Bay 62 mph/100 km/h, Flushmount Backstop . Impact Attenuator TAU-II, 4 Bay 44 mph/70 km/h, Wide Flange Backstop