This chapter provides human factors design relevant to Safety/Warning Functions of ATIS devices. Safety/Warning Functions provide warnings of unsafe conditions and situations affecting the driver on the roadway ahead. Safety/Warning Functions provide sufficient advance warning to permit the driver to take remedial action. Safety/Warning Functions provide messages related to relatively transient conditions, requiring modifications to the messages at irregular intervals. It should also be noted that mayday systems have been subsumed under Safety/Warning Functions for the purposes of the present discussion. Safety/Warning Functions do not encompass in-vehicle warnings of imminent danger requiring immediate action (e.g., collision avoidance devices).

The following design topics are included in this chapter:

• Presentation of Immediate Hazard Warning Information
• Presentation of Approaching Emergency Vehicle Information
• Presentation of Automatic/Manual Aid Request Information

• Presentation of Road Condition Information
• Presentation of Vehicle Condition Monitoring Information
• Relationship Between ATIS Information and Roadway Signs

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