Roadway crash cushion
A crash cushion that may be used as a traffic barrier end treatment is constructed to prevent an impacting vehicle from lifting off the ground and to minimize fragmentation and that is compatible with BTMs without compromise to impact mitigation performance. The crash cushion includes a nose assembly and a number of energy-absorbing modules connected to the nose assembly and to one another in an end-to-end fashion. The energy-absorbing elements are not all identical, but instead are constructed with different features and positioned or sequenced in particular ways to achieve specific performance objectives.
1 . A crash cushion for absorbing forces from a vehicle that impacts the crash cushion, the crash cushion comprising:
a nose assembly having a forward vehicle-contacting end and a rearward end and comprising a wedge incline, the wedge incline having an upper surface that slopes downward from the forward end of the nose assembly toward the rearward end of the nose assembly;
an energy-absorbing module of a first type attached to the nose assembly, the energy absorbing module of the first type comprising an unfilled crash cushion element; an incline recess that receives the wedge incline of the nose assembly to lift and drive the energy-absorbing module of the first type upward when the nose assembly is driven toward the energy-absorbing module of the first type by the vehicle; and a wedge incline, the wedge incline having an upper surface that slopes downward from a forward end of the energy-absorbing module toward a rearward end of the energy-absorbing module; and
at least one energy-absorbing module of a second type attached to the energy-absorbing module of the first type, the energy absorbing module of the second type comprising a liquid filled crash cushion element; an incline recess that receives the wedge incline of the energy-absorbing module of the first type to lift and drive the energy-absorbing module of the second type upward when the nose assembly is driven toward the energy-absorbing module of the first type by the vehicle; and a wedge incline.
2 . The crash cushion as set forth in claim 1 , further comprising at least one energy-absorbing module of a third type attached to the energy-absorbing module of the second type, the energy absorbing module of the third type comprising a liquid filled crash cushion element; and an incline recess that receives the wedge incline of the energy-absorbing module of the second type to lift and drive the energy-absorbing module of the third type upward when the nose assembly is driven toward the energy-absorbing module of the first type by the vehicle.
3 . The crash cushion as set forth in claim 2 , further comprising at least one energy-absorbing module of a fourth type attached to the energy-absorbing module of the third type, the energy absorbing module of the fourth type comprising a liquid filled crash cushion element with a volume greater than a volume of the crash cushion element of the third type.
4 . The crash cushion as set forth in claim 1 , the nose assembly further comprising:
a forward component with a forward section from which the wedge incline extends; and
a rearward component that is spaced from the forward component and configured to be driven upward by the wedge incline when the forward component is driven toward the rearward component by the vehicle.
5 . The crash cushion as set forth in claim 1 , the energy-absorbing module of the first type further comprising:
a hinge plate assembly comprising:
a forward structure which includes the incline recess;
a rearward structure;
wherein the wedge incline is formed between the forward structure and the rearward structure.
6 . The crash cushion of claim 5 , wherein the forward structure includes a forward hinge component for pivotally connecting the energy-absorbing module of the first type to the nose assembly; and wherein the rearward structure includes a rearward hinge component for pivotably connecting the energy-absorbing module of the first type to one of the energy-absorbing modules of the second type.
7 . The crash cushion as set forth in claim 1 , the energy-absorbing module of the second type further comprising:
a hinge plate assembly comprising:
a forward structure which includes the incline recess;
a rearward structure;
wherein the wedge incline is formed between the forward structure and the rearward structure.
8 . The crash cushion of claim 7 , wherein the forward structure includes a forward hinge component for pivotally connecting the energy-absorbing module of the second type to the energy-absorbing module of the first type or another energy-absorbing module of the second type; and wherein the rearward structure includes a rearward hinge component for pivotably connecting the energy-absorbing module of the second type to one of the energy-absorbing modules of the third type or another energy-absorbing module of the second type.
9 . The crash cushion as set forth in claim 2 , the energy-absorbing module of the third type further comprising a hinge plate assembly comprising:
a forward structure; and
a rearward structure.
10 . The crash cushion of claim 9 , wherein the forward structure includes a forward hinge component; and wherein the rearward structure includes a rearward hinge component.
11 . The crash cushion as set forth in claim 3 , the energy-absorbing module of the fourth type further comprising a hinge plate assembly comprising:
a forward structure; and
a rearward structure.
12 . The crash cushion of claim 11 , wherein the forward structure includes a forward hinge component; and wherein the rearward structure includes a rearward hinge component.
13 . The crash cushion as set forth in claim 1 , the crash cushion comprising two of the energy-absorbing modules of the second type positioned end-to-end.
14 . The crash cushion as set forth in claim 2 , the crash cushion comprising three of the energy-absorbing modules of the third type positioned end-to-end.
15 . The crash cushion as set forth in claim 3 , the crash cushion comprising three of the energy-absorbing modules of the fourth type positioned end-to-end.
16 . The crash cushion as set forth in claim 3 , further comprising a transition component attached to one of the energy-absorbing modules of the fourth type for attaching the crash cushion to a traffic divider.
17 . A crash cushion for absorbing forces from a vehicle that impacts the crash cushion, the crash cushion comprising:
a nose assembly comprising:
a forward component comprising:
a forward section; and
a wedge incline extending rearwardly from the forward section, the wedge incline having an upper surface that slopes downwardly from the forward section; and
a rearward component that is spaced from the forward component and configured to be lifted and driven upward by the wedge incline when the forward component is driven toward the rearward component by the vehicle;
an energy-absorbing module of a first type attached to the nose assembly, the energy absorbing module of the first type comprising:
a hinge plate assembly comprising:
a forward structure having an incline recess that receives the wedge incline of the nose assembly to drive the forward structure upward when the nose assembly is driven toward the first energy-absorbing module by the vehicle;
a rearward structure;
a wedge incline between the forward structure and the rearward structure,
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of a first amount, the chamber enclosing air but no liquids;
at least two energy-absorbing modules of a second type attached end-to-end to the energy-absorbing module of the first type, each of the energy absorbing modules of the second type comprising:
a hinge plate assembly comprising:
a forward structure having an incline recess that receives the wedge incline of the energy-absorbing module of the first type or the wedge incline of one of the other energy-absorbing modules of the second type to drive the forward structure upward when the crash cushion is impacted by the vehicle;
a rearward structure;
a wedge incline between the forward structure and the rearward structure,
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of the first amount and enclosing liquid within the chamber;
at least two energy-absorbing modules of a third type attached end-to-end to the energy-absorbing modules of the second type, each of the energy absorbing modules of the third type comprising:
a hinge plate assembly comprising:
a forward structure having an incline recess that receives the wedge incline of one of the energy-absorbing modules of the second type or the wedge incline of one of the other energy-absorbing modules of the third type to drive the forward structure upward when the crash cushion is impacted by the vehicle;
a rearward structure;
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of the first amount and enclosing liquid within the chamber;
at least two energy-absorbing modules of a fourth type attached end-to-end to the energy-absorbing modules of the third type, each of the energy absorbing modules of the fourth type comprising:
a hinge plate assembly comprising:
a forward structure having an incline recess that receives the wedge incline of one of the energy-absorbing modules of the third type or the wedge incline of one of the other energy-absorbing modules of the fourth type to drive the forward structure upward when the crash cushion is impacted by the vehicle;
a rearward structure;
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of a second amount greater than the first amount, the chamber enclosing liquid.
18 . The crash cushion as set forth in claim 17 , the crash cushion comprising two of the energy-absorbing modules of the second type positioned end-to-end.
19 . The crash cushion as set forth in claim 17 , the crash cushion comprising three of the energy-absorbing modules of the third type positioned end-to-end and three of the energy-absorbing modules of the fourth type positioned end-to-end.
20 . A crash cushion for absorbing forces from a vehicle that impacts the crash cushion, the crash cushion comprising:
a nose assembly comprising:
a forward component comprising:
a forward section; and
a wedge incline extending rearwardly from the forward section, the wedge incline having an upper surface that slopes downwardly from the forward section; and
a rearward component that is spaced from the forward component and configured to be lifted and driven upward by the wedge incline when the forward component is driven toward the rearward component by the vehicle;
a first energy-absorbing module attached to the nose assembly, the first energy absorbing module comprising:
a hinge plate assembly comprising:
a forward structure having an incline recess that receives the wedge incline of the nose assembly to drive the forward structure upward when the nose assembly is driven toward the first energy-absorbing module by the vehicle;
a rearward structure;
a wedge incline between the forward structure and the rearward structure,
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of a first amount, the chamber enclosing air but no liquids;
a second energy-absorbing module attached to the first energy-absorbing module, the second energy absorbing module comprising:
a hinge plate assembly comprising:
a forward structure having an incline recess that receives the wedge incline of the first energy-absorbing module to drive the forward structure upward when the first energy-absorbing module is driven toward the second energy-absorbing module by the vehicle;
a rearward structure;
a wedge incline between the forward structure and the rearward structure,
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of the first amount and enclosing liquid within the chamber;
a third energy-absorbing module attached to the second energy-absorbing module, the third energy absorbing module comprising:
a hinge plate assembly comprising:
a forward structure having an incline recess that receives the wedge incline of the second energy-absorbing module to drive the forward structure upward when the second energy-absorbing module is driven toward the third energy-absorbing module by the vehicle;
a rearward structure;
a wedge incline between the forward structure and the rearward structure,
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of the first amount and enclosing liquid within the chamber;
a fourth energy-absorbing module attached to the third energy-absorbing module, the fourth energy absorbing module comprising:
a hinge plate assembly comprising:
a forward structure having an incline recess that receives the wedge incline of the third energy-absorbing module to drive the forward structure upward when the third energy-absorbing module is driven toward the fourth energy-absorbing module by the vehicle;
a rearward structure;
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of the first amount and enclosing liquid within the chamber;
a fifth energy-absorbing module attached to the fourth energy-absorbing module, the fifth energy absorbing module comprising:
a hinge plate assembly comprising:
a forward structure;
a rearward structure;
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of the first amount and enclosing liquid within the chamber;
a sixth energy-absorbing module attached to the fifth energy-absorbing module, the sixth energy absorbing module comprising:
a hinge plate assembly comprising:
a forward structure;
a rearward structure;
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of the first amount and enclosing liquid within the chamber;
a seventh energy-absorbing module attached to the sixth energy-absorbing module, the seventh energy absorbing module comprising:
a hinge plate assembly comprising:
a forward structure;
a rearward structure;
a substantially hollow crash cushion element supported by the hinge plate assembly, the crash cushion element having an enclosed chamber having an interior volume of a second amount that is greater than the first amount, the enclosed chamber enclosing liquid within the chamber.
21 . A crash cushion for absorbing forces from a vehicle that impacts the crash cushion, the crash cushion comprising:
a nose assembly having a forward vehicle-contacting end and a rearward end and comprising a wedge incline, the wedge incline having an upper surface that slopes downward from the forward end of the nose assembly toward the rearward end of the nose assembly;
a first energy-absorbing module attached to the nose assembly, the first energy absorbing module comprising a crash cushion element; an incline recess that receives the wedge incline of the nose assembly to lift and drive the energy-absorbing upward when the nose assembly is driven toward the first energy-absorbing module by the vehicle; and a wedge incline; and
a second energy-absorbing module attached to the first energy-absorbing module, the second energy absorbing module comprising a crash cushion element; an incline recess that receives the wedge incline of the energy-absorbing module of the first type to lift and drive the second energy-absorbing module upward when the nose assembly is driven toward the first energy-absorbing module type by the vehicle.