Vehicle mounted crash impact attenuator

A sensor support assembly, comprising:

• a frame member adapted to be fixed on a vehicle structure;
• and
• a support member adapted to be inserted in a recess defined in the frame member;
• the support member configured to receive a sensor on a front face of the support member;
• the support member configured to retain the sensor at or near a surface of a body panel of a vehicle that is susceptible to an impact from an object;
• the recess defining a longitudinal axis (X) along which the support member can displace from a normal position (P1) to a collapse position (P2) when an axial force (F1) from the impact applied on the support member exceeds a predetermined threshold (F0);
• the support member being substantially outside the recess in the normal position (P1) and substantially inside the recess in the collapse position (P2);
• the support member being guided during the displacement between side faces of the frame member and side faces of the support member;
• and
• a longitudinal rail arranged in a clearance (C) defined between the support member and the side faces of the frame member, the longitudinal rail being integral to the frame member and defining a longitudinal linear tip in contact against an opposing side face of the support member, wherein said longitudinal linear tip defines a sharp edge in permanent contact with said opposing side face.