Minnesota Department of Transportation

511 Travel Info

Work Zone Safety Tools - Crashworthy Devices

 

Orange barrels on a highway

Crashworthy Devices

Crashworthy Devices Information

(MASH/NCHRP 350)

Contact MnDOT for crashworthy device information

Crash Testing Requirement for Work Zone Safety Devices

 

Category 1

Includes small and lightweight channelizing and delineating devices. These devices include cones, tubular markers, flexible delineater posts and plastic drums.

  • Manufacturers can self-certify as MASH-16 compliant.

Category 2

Includes devices that are not expected to produce significant vehicular velocity change but may otherwise be hazardous. Examples include sign supports, barricade supports, small portable (balloon) lighting, and Category 1 devices with attachments or sign panels.

  • Devices manufactured after December 31, 2019 must be MASH-16 Compliant.
  • NCHRP-350 devices purchased before December 31, 2019 may be used until December 31, 2024. This includes ground mounted sign supports.
  • Knee brace may no longer be installed after June 30, 2020.

Category 3

Includes hardware that is expected to cause significant velocity change or other potentially harmful reactions to impacting vehicles. Examples include temporary barrier, crash cushions and truck/trailer mounted attenuators.

Except for temporary barrier
  • Devices manufactured after December 31, 2019 must be MASH-16 compliant.
  • NCHRP-350 devices purchased before December 31, 2019 may be used until December 31, 2029.
Temporary Barrier
  • Portable concrete barrier that meets MnDOT specifications is considered acceptable.
  • All other temporary barrier used after December 31, 2019 must be MASH-16 compliant.
  • MnDOT owned temporary barrier may be used for its useful life, MnDOT will only purchase MASH-16 compliant barrier after December 31, 2019

Category 4

Trailer mounted devices such as portable changeable message signs, arrow boards, automated flagging assistance devices, portable signals, and cameras.

  • Historically not considered crashworthy. MnDOT will perpetuate Category 4 requirements:
    • Should be shielded when possible
    • Should be removed when not needed
    • Shall be delineated when deployed and not shielded

MnDOT Tech Memo (19-03-T-01) Crashworthy Requirements of TTC Devices - Effective August 1, 2019

Crashworthy Device Certificate of Compliance Form (PDF 89.7 KB)

FHWA website for Approved Work Zone Devices

Type III Barricades - NCHRP 350 Approved (PDF)

MnDOT approved generic sign designs

Portable Sign Support Structures.

Temporary Portable Concrete Barrier

Standard Plate

The contractor shall furnish and install portable precast median barriers in accordance with current specification. MnDOT Standard Plate 8337

Special Provision and Quality Specifications

Provides description of MnDOT Standard Plate 8337 and shows examples of: Barriers - Acceptable and Unacceptable (PDF 2.5 MB)