Driver Hazard Response When Processing On-road and In-vehicle Messaging of Non-Safety-Related Information

Abstract

With advances in vehicle technologies, more information can be communicated in real-time to drivers via in-vehicle interfaces. In-vehicle messaging can be used for safety related information, such as warnings, as well as non-safety related information, such as upcoming gas stations. While much research has focused on the design of messaging safety-related information, little is known about the best practice for in-vehicle messaging non-safety-related information. The current study aimed to examine how drivers process service logos – as an example of non-safety-related information – and respond to road hazards when logos are presented on: (1) an on-road sign panel, (2) an in-vehicle display, or (3) a combination of both. It was found that drivers generally identified logos with high accuracy and low workload across the presentation conditions. Driver reactions to road hazards were slower when logos were present for processing, although the number of collisions did not increase. Although the majority of drivers self-reported a preference for the on-road presentation, the simultaneous presentation of logos on-road and in-vehicle showed a benefit on driver hazard negotiation (fewer collisions). Older drivers were less accurate in identifying logos but also had fewer collisions, likely due to them being more cautious and allocating more attention to the driving task. Findings of this study provide support for use of in-vehicle presentation of non-safety-related information in addition to existing on-road signage.