Literature review – Performance measures from CAMP, ISO, IVBSS, NCAP, and/or Calspan

Supporting data – Related EDR, GES, IVBSS, and NCAP test data

Assumptions – Parameters such as:

Analysis – Kinematic equations that represent each target scenario such as:

Recommended measures and technical considerations – Performance measures, qualitative recommendations, and quantitative recommendations in addition to any assumptions that were made.

Methodology

Identify primary measures of performance for target V2V safety applications

Recommend preliminary performance at the system level

Consider additional performance measures for sensing/communication needs and crash avoidance decisions

.  A plot of the time that is available to take the evasive maneuver for crash avoidance versus the intensity of action needed to avoid the crash for advisories, warnings, and automatic control is shown in Figure 1.1 [4].  The preliminary performance recommendations made in this report are determined for the three crash avoidance action categories.

The study of performance metrics considers all these factors and determines performance measures and recommendations of collision avoidance systems as they are affected by several considerations.  Some of them are vehicle related and the others driver dependent as illustrated in Figure 1.2.  Most of the vehicle variables have a wide operating range with significant differences especially in certain operating regions.  This leads to either defining performance metrics as dependent on specific technologies or design methodology, or combination of all technologies/vehicle implementations.  Figure 1.2 does not show the system delay that is defined as the time required to acquire the information external and internal to the vehicle, process the data, and execute algorithms to determine the action as defined in Figure 1.1.  Normally, this delay is much shorter compared to overall delays in the system.

Critical performance levels indicate the latest time and closest range for which information is communicated to the driver or the vehicle takes action.  Various system and driver characteristics are accounted for in Imminent Warning recommendations