2/6/2025 | 11:00 AM - 1:00 PM | Regency A

Impact of camera height and field-of-view on distance judgement and gap selection in digital rear-view mirrors in vehicles

Author(s)

Felix Thulinsson | RISE Research Institutes of Sweden AB
Niclas Söderlund | RISE Research Institutes of Sweden AB
Shirin Rafiei | RISE Research Institutes of Sweden AB
Bo Schenkman | RISE Research Institutes of Sweden AB
Anders Djupsjöbackaa | RISE Research Institutes of Sweden AB
Börje Andrén | RISE Research Institutes of Sweden AB
Kjell Brunnström | RISE Research Institutes of Sweden AB

Abstract

This study investigates how different camera perspectives presented in digital rear-view mirrors in vehicles, a.k.a. Camera Monitor Systems (CMS), impact on drivers’ distance judgement and decision-making in dynamic driving scenarios. The study examines (1) the effects of field of view and (2) camera height on drivers' ability to judge distances to rearward vehicles and to select safe gaps in potentially hazardous situations. A controlled video experiment was conducted, involving 27 participants who performed distance estimations and last safe gap selection tasks using a simulated side-view mirror display. Participants viewed pre-recorded driving scenarios with varying combinations of field of view (40°, 76°, 112°) and camera heights (1 meter, 2.3 meter). The results indicate that no significant effects were found for camera height, but wider field of views led to more accurate distance estimations. However, the use of a wider field of view also increased the risk of potentially dangerous overestimations of distance, as evidenced by the last safe gap results. They suggest that a wider field of view leads to the selection of smaller and potentially risky gaps. Conversely, narrow field of views resulted in underestimations of distance, potentially leading to overly cautious and less efficient driving decisions. These findings inform CMS design guidelines how to improve driver perception and road safety, in order to reduce accidents from vehicle distance misjudgments.