Minnesota Department of Transportation

511 Travel Info

Work Zone Safety - Approved Vehicle Lighting


Orange barrels on a highway

Vehicle Safety Lighting Specification

All Contractors', subcontractors' and suppliers' mobile equipment, operating within the limits of the Project with potential exposure to passing traffic, shall be equipped with operable warning lights which meet the appropriate requirements of the SAE specifications.  This would include closed roads that are open to local traffic only.  This also includes any vehicle which enters the traveled roadway at any time. 

The SAE specification requirements are as follows:

  • 360 Degree Rotating Lights - SAE Specification J845
  • Flashing Lights - SAE Specification J595
  • Flashing Strobe Lights - SAE Specification J1318

Lights shall be mounted so that at least one light is visible at all times when viewed from a height of 3.5 feet and from a 60 foot radius about the equipment.  In order to meet the 360 degree at 60 foot radius requirements supplemental lighting may be used in addition to the lights on the Approved Products List. All supplemental lights must be SAE Class 1 certified.  This specification is to be used for both day and night time operations.  All costs incurred to provide warning lights shall be at no cost to the Department.  These warning lights shall also be operating and visible when a vehicle decelerates to enter a construction work zone and again when a vehicle leaves the work zone and enters the traveled traffic lane.

Contractor shall equip their vehicles with lights that are on the Approved Products List which can be found at: http://www.dot.state.mn.us/products/vehiclelighting/index.html