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A collision attenuator for a vehicle including an energy absorbing cylinder, a mounting assembly adapted to secure the energy absorbing cylinder to an end of the vehicle, a contact plate mounted to the energy absorbing cylinder, a control valve for extending and retracting the energy absorbing cylin

A collision attenuator for a vehicle including an energy absorbing cylinder, a mounting assembly adapted to secure the energy absorbing cylinder to an end of the vehicle, a contact plate mounted to the energy absorbing cylinder, a control valve for extending and retracting the energy absorbing cylinder in order to move the contact plate with respect to the end of the vehicle. A comparator is operably coupled with the control valve, wherein the comparator is configured to adjust the energy absorbing cylinder based upon a speed signal indicative of the speed of the moving vehicle. A coupler detector is operably coupled with the control valve, wherein the coupler detector inhibits the extension of the energy absorbing cylinder unless the coupler detector determines that the coupler is open. A pivot assembly pivotally secures the contact plate to the energy absorbing cylinder allowing the contact plate to pivot laterally about an upright axis with respect to the energy absorbing cylinder. A quick-release mechanism detachably secures the energy absorbing assembly to the end of the vehicle. A vehicle support portion extends horizontally forward adjacent a bottom edge of the contact plate.

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1. A collision attenuator for vehicle having a coupler, said attenuator comprising:an energy absorbing cylinder; a mounting assembly adapted to secure said energy absorbing cylinder to an end of the vehicle; a contact plate mounted to said energy absorbing cylinder; a control valve for extending and

1. A collision attenuator for vehicle having a coupler, said attenuator comprising:an energy absorbing cylinder; a mounting assembly adapted to secure said energy absorbing cylinder to an end of the vehicle; a contact plate mounted to said energy absorbing cylinder; a control valve for extending and retracting said energy absorbing cylinder in order to move said contact plate with respect to the end of the vehicle; and a coupler detector operable coupled with said control valve, wherein said coupler detector inhibits the extension of said energy absorbing cylinder unless the coupler detector determines that the coupler is open. 2. The collision attenuator of claim 1, wherein said mounting assembly is adapted to pivotally secure said energy absorbing cylinder to the end of the vehicle, and wherein said contact plate is longitudinally extendable and laterally displaceable with respect to the end of the vehicle, said collision attenuator further compromising a comparator operably coupled with said control valve, wherein said comparator is configured to control said energy absorbing cylinder based upon a speed signal indicative of the speed of the moving vehicle.3. The collision attenuator a claim 2, wherein a coefficient of energy absorption of said energy absorbing cylinder is adjustable and said comparator is configured to adjust the coefficient of energy absorption.4. The collision attenuator of claim 2, said collision attenuator further comprising a minimum speed detector, wherein said comparator inhibits the extension of said energy absorbing cylinder until the vehicle reaches minimum threshold speed.5. The collision attenuator a claim 2, wherein said energy absorbing cylinder is either a double acting hydraulic cylinder or a double acting pneumatic cylinder.6. The collision attenuator of claim 2, wherein said mounting assembly comprises a quick-release mechanism for detachable securing said energy absorbing assembly to the end of the vehicle.7. The collision attenuator of claim 1, wherein said energy absorbing cylinder is either a double acting hydraulic cylinder or a double acting pneumatic cylinder.8. The collision attenuator of claim 1, said collision attenuator further comprising a comparator operably coupled with said control valve, wherein said comparator is configured to adjust said energy absorbing cylinder based upon a speed signal indicative of the speed of the moving vehicle.9. The collision attenuator of claim 1, wherein said mounting assembly is adapted to pivotally secure said energy absorbing cylinder to the end of the vehicle, said collision attenuator further comprising a pivot assembly pivotally securing said contact plate to said energy absorbing cylinder allowing said contact plate to pivot laterally about an upright axis with respect to said energy absorbing cylinder, wherein contact plate is longitudinally extendable and laterally displaceable with respect to the end of the vehicle.10. The collision attenuator according to claim 9, said collision attenuator further comprising a diagonally oriented lateral energy absorbing unit configured to interconnect a portion of said energy absorbing cylinder to the vehicle.11. The collision attenuator according to claim 9, wherein said contact plate pivots with respect to said energy absorbing cylinder about a vertical axis.12. The collision attenuator of claim 9, wherein said mounting assembly comprises a quick-release mechanism for detachably securing said energy absorbing assembly to the end of the vehicle.13. The collision attenuator a claim 9, wherein said contact plate comprises a laterally expandable section.14. A collision attenuator for a vehicle, said attenuator comprising:an energy absorbing cylinder; a mounting assembly adapted to secure said energy absorbing cylinder to an end of the vehicle; a contact plate mounted to said energy absorbing cylinder; a control valve for extending and retracting said energy absorbing cylinder in order to move said contact plate with respect to the end of the vehicle; and wherein said contact plate includes a laterally expandable section that is located intermediate opposing lateral ends of said contact plate and is configured to laterally expand upon impact. 15. Th collision attenuator of claim 14, wherein said laterally expandable section includes an obtuse angled portion that is configured to at least partially flatten upon impact to cause lateral expansion of said contact plate.16. The collision attenuator of claim 14, further comprising a plurality of energy absorbing cylinders, said contact plate mounted to an outer end of each one of said energy absorbing cylinders.17. The collision attenuator of claim 16, further comprising a plurality of mounting assemblies adapted to secure said plurality of energy absorbing cylinders to the end of the vehicle, wherein at least of said one mounting assemblies includes a horizontal pivot allowing said one mounting assembly and a corresponding energy absorbing cylinder to pivot with respect to the end of the vehicle.18. The collision attenuator of claim 14, wherein said contact plate comprises a vehicle support portion extending along and forward from a bottom edge of said contact plate.19. The collision attenuator of claim 18, said collision attenuator further comprising a comparator operably couple with said control valve, wherein said comparator is configured to adjust said energy absorbing cylinder based upon a speed signal indicative of the speed of the moving vehicle.20. The collision attenuator of claim 19, said collision attenuator further comprising a pivot assembly pivotally securing said contact plate to said energy absorbing cylinder allowing said contact plate to pivot laterally about an upright axis with respect to said energy absorbing cylinder.21. The collision attenuator of claim 14, further comprising a pair of energy absorbing cylinders, said contact plate mounted to an outer end of each one of said energy absorbing cylinders such that said laterally expandable section is located between said pair of energy absorbing cylinders.22. The collision attenuator of claim 15, further comprising a pair of energy absorbing cylinders said contact plate mounted to an outer end of each one of said energy absorbing cylinders such that said obtuse angled portion is located between said pair of energy absorbing cylinders.