Structural tube based vehicle crash fence

An energy dissipating joint for connecting a rail to a post in a vehicle barrier fence comprising:

• a generally upstanding post having a top end and at least one side wall defining an interior cavity;
• an elongate rail having generally opposing ends, at least one of the ends being supported by the post;
• a receiver disposed in the at least one side wall adjacent the top end, the receiver having a pair of generally spaced apart bearing ends defining an opening through the at least one side wall through which the rail may extend;
• and
• at least one deformable flange attached adjacent to one end of the rail and extending outwardly generally orthogonally to the rail, the at least one deformable flange being disposed in the interior cavity and configured to contact one or more of the bearing ends to resist longitudinal movement of the rail by dissipating energy through deformation of the at least one deformable flange.