Safety fences

A cable safety fence comprising:

• at least one upper cable held in tension and supported in slots formed in the top of a plurality of respective posts, thereby permitting the upper cable to be separated from at least one post under impact by a vehicle, each of said plurality of posts having a cross-section in the shape of a `S` section or `Z` section such that a rounded corner of each post faces a direction of the vehicle;
• a pair of lower continuous interwoven cables held in tension along an entire length of each of said pair of cables and around the opposite sides of and crossing between selected ones of said plurality of posts;
• and
• locating means provided on the posts for positioning the pair of lower cables at a predetermined height on each of said plurality of posts, whereby the lower pair of cables are also detachable from the locating means on the at least one post upon impact by the vehicle while remaining held in tension around the post as the at least one post is bent to the ground subsequent to the release of the at least one upper cable from that one post;
• wherein the combination of said at least one upper cable and said pair of lower cables substantially delays post deformation and collapse upon impact by the vehicle.