The Integrated Vehicle-Based Safety System Field Operational Test (IVBSS FOT) was conducted to develop and evaluate an integrated system of crash warning technologies. A field operational test was conducted with prototype integrated crash warning systems onboard both passenger vehicles and heavy trucks. The evaluation reported here focused on driver acceptance of the integrated system, as well as identifying changes in driver behavior associated with the system. The integrated system was designed to address rear-end, lateral drift, and lanechange/ merge crashes. The light vehicle system also addressed curve speed crashes.

One hundred and eight light vehicle drivers and 18 professional heavy truck drivers were recruited for the field operational test. The passenger car drivers used a prototype vehicle as their own personal vehicle. The commercial drivers used the heavy truck as part of their daily work. A data acquisition system captured onboard data, and analyses were conducted on driver performance and secondary task behaviors. Subjective feedback from questionnaires, debrief interviews, and focus groups were also analyzed.

Drivers on both vehicle platforms were largely accepting of these systems. Several behaviors were observed to be influenced by the presence of these systems;​ other behaviors were unaffected.