HAZALERT improves construction site safety by identifying hazardous areas and alerting drivers/operators of machinery to their proximity to these hazards. HAZALERT combines two techniques for identifying hazards – Proximity and Location Awareness.





Proximity involves the placement of tags at any hazardous area on the construction site. An alert is then sent to drivers/operators based on their proximity to the hazard.

HAZALERT has three warning levels:

  • Yellow: This is a low level alert indicating that there is a hazard nearby.
  • Amber: This is a medium level alert indicating that the vehicle is getting closer to a hazard.
  • Red: This is a high level alert indicating that the vehicle is in a prohibited area where it is dangerous to operate.

The system can be adapted to meet specific environmental conditions through both the placement of the tags and the various distances used at each warning

Location Awareness involves the plotting of the construction site as a Cartesian grid. The point of origin (0,0) can be the site office or a datum point on the construction site.

Tags are placed at selected locations around the site that will allow each vehicle to range with at least three tags from any location. The X,Y position of these tags are then recorded in HAZALERT. Using this configuration allows any HAZALERT equipped vehicle to calculate its position on the site.

A site engineer can now map out the location of hazards in HAZALERT and vehicles now have an awareness of their environment and can be alerted accordingly.