Article ID: 21000616
Driver assistance projection technology, in which specific symbols are projected onto the road ahead of a vehicle using an adaptive driving beam (ADB), has been developed to assist drivers in driving safety; However, depending on how the projection used, it may distract the driver in the host vehicle as well as others on the road such as other drivers, pedestrians and cyclists. Thus, we conducted an experiment to validate the safety and readability of the projections. The effect of symbol projection on safe driving was investigated by measuring the drivers' response time in response to the brake lights of the vehicle in front. We also evaluated the readability of the symbols for the host vehicle drivers and other road users. Under the conditions of this experiment, when a symbol was projected onto the road, their response time was 0.1 to 0.2 s slower than when it was not projected. We also verified that the response time was longer when the symbol was difficult to read such as lamp low luminous intensity and far projected and that symbols projected with high luminous intensity near the vehicle were more noticeable for both host vehicle drivers and pedestrians. The results show that the luminous intensity, projected position, and size of the symbols need to be adjusted accordingly such that they can be easily read by the driver of the host vehicle without interfering with other road users.
