Rockfall barrier

A rockfall barrier comprising:

• a plurality of support posts, each support post comprising:
• a base fixed to a sloped surface;
• a first arm connected to the base;
• a second arm connected to the first arm, wherein the second arm is a continuous, non-hinged arm, the second arm is longer than the first arm, and the second arm is not connected to any arm other than the first arm;
• and
• wherein the first arm is at a 0°-90° angle to the normal of the sloped surface and the second arm is at a 0°-90° angle to the normal to the sloped surface, wherein the first arm and the second arm form a concavity facing an upslope direction;
• and
• a deformable net, capable of sustaining multiple rock fall impacts, spanning the plurality of support posts and
• at least one guy wire attached at one end to a distal end of one of the plurality of support posts and anchored at the other end to the sloped surface;
• wherein the first arm is pivotally coupled to the base at a first hinge comprising a first hinge brake, the first hinge brake comprising a first pair of friction surfaces connected to or integral with the base that frictionally engage a second pair of friction surfaces connected to or integral with the first arm to provide controlled relative pivotal rotation between the first arm and the base;
• wherein the second arm is pivotally coupled to the first arm at a second hinge comprising a second hinge brake, the second hinge brake comprising a third pair of friction surfaces connected to or integral with the second arm that frictionally engage a fourth pair of friction surfaces connected to or integral with the first arm to provide controlled relative pivotal rotation between the second arm and the first arm.