49 CFR § 587.6 - General description.

---
identifier: "/us/cfr/t49/s587.6"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 587.6 - General description."
title_number: 49
title_name: "Transportation"
section_number: "587.6"
section_name: "General description."
chapter_name: "NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
part_number: "587"
part_name: "DEFORMABLE BARRIERS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 322, 30111, 30115, 30117, and 30166; delegation of authority at 49 CFR 1.50."
regulatory_source: "55 FR 45779, Oct. 30, 1990, unless otherwise noted."
cfr_part: "587"
---


# 587.6 General description.

(a) The moving deformable barrier consists of component parts and component assemblies which are described in drawings and specifications that are set forth in this § 587.6 of this chapter (incorporated by reference; see § 587.5).

(b) The moving deformable barrier specifications are provided in the drawings shown in DSL-1278 through DSL-1287, except DSL-1282, and the drawing shown in DSL-1290 (DSL-1278 through DSL-1287, except for DSL-1282, and DSL-1290 are incorporated by reference; see § 587.5).

(1) The specifications for the final assembly of the moving deformable barrier are provided in the drawings shown in DSL-1278, dated June 2002.

(2) The specifications for the frame assembly of the moving deformable barrier are provided in the drawings shown in DSL-1281, dated August 20, 1980.

(3) The specifications for the face of the moving deformable barrier are provided in the drawings shown in DSL-1285, dated October 1991, and DSL-1286, dated August 20, 1980.

(4) The specifications for the ballast installation and details concerning the ballast plate are provided in drawings shown in DSL-1279 and DSL-1280, both dated August 20, 1980.

(5) The specifications for the hub assembly and details concerning the brake are provided in drawings shown in DSL-1283, dated October 1991.

(6) The specifications for the rear guide assembly are provided in drawings shown in DSL-1284, dated August 20, 1980.

(7) The specifications for the research axle assembly are provided in drawings shown in DSL-1287, dated October 1991.

(8) The specifications for the compliance axle assembly are provided in drawings shown in DSL-1290, dated October 1991.

(c) In configuration 2 (with two cameras and camera mounts, a light trap vane, and ballast reduced), the moving deformable barrier (crabbable axle), including the impact surface, supporting structure, and carriage, weighs 3,015 pounds, has a track width of 74 inches, and has a wheelbase of 102 inches.

(d) In configuration 2, the moving deformable barrier has the following center of gravity:

X = 44.2 inches rear of front axle

Y = 0.3 inches left of longitudinal center line

Z = 19.7 inches from ground.

(e) The moving deformable barrier has the following moment of inertia:

Pitch = 1669 ft-lb-sec
<sup>2</sup>

Roll = 375 ft-lb-sec
<sup>2</sup>

Yaw = 1897 ft-lb-sec
<sup>2</sup>

[55 FR 45779, Oct. 30, 1990; 56 FR 47011, Sept. 17, 1991, as amended at 57 FR 7558, Mar. 3, 1992; 68 FR 44472, July 29, 2003]