Outdoor Evaluation Experiment Under Daytime and Nighttime Conditions on Perception of Automated Driving System Marker Lamps (First Report)
-When a Linear Marker Lamp is Installed at the Front Edge of the Roof-

Akihiro Abe･Yoko Kato･Michiaki Sekine･Yoshiro Aoki (NALTEC)

In WP29, discussions are being held regarding the requirements for “Automated Driving System (ADS) Marker Lamp” that indicates the status of ADS. In this study, an evaluation lamp with blue-green chromaticity specified in SAE J3134 was mounted on the roof of a passenger vehicle. Outdoor experiments were conducted under both daytime and nighttime conditions to evaluate its visibility as perceived by general drivers under various lighting conditions, including changes in luminous intensity, modulation waveform, and modulation frequency. The study also examined how the lamp was perceived when lit simultaneously with other vehicle lamps, such as direction indicators.

Outdoor Evaluation Experiment Under Daytime and Nighttime Conditions on Perception of Automated Driving System Marker Lamps (Second Report)
-When Marker Lamps are Installed Near Headlamp Unit-

Michiaki Sekine･Akihiro Abe･Yoko Kato･Yoshiro Aoki (NALTEC)

We investigated the visibility of small blue-green marker lamps, which indicate that the vehicle is in automated driving mode, when they are installed near the headlamp unit of an actual vehicle, both day and night, outdoors. We conducted subjective evaluation experiments on visibility, annoyance, and glare when only the marker lamp is turned on, and also considered how it looks when the direction-indicator and passing-beam are turned on at the same time.

Effects of Angular Velocity and Time Interval of Sequential Visual Stimuli Presented in Peripheral Vision on Large-Angle Gaze Guidance During Driving

Masanori Takemoto (Seikei University)

As a driving support system to facilitate confirmation of pedestrians and bicycles during left turns at signalized intersections, two dynamic visual stimuli moving horizontally were designed and presented in the driver's peripheral vision. This study conducted a simulator experiment to measure gaze data, analyzed the relationship between gaze movement and visual stimuli motion in detail, and examined the effects of the angular velocity and time interval of the two visual stimuli on gaze guidance.

Comparison of Reaction Times for Safety Colors

Shimpei Yamada (University of Occupational and Environmental Health)

Safety colors were adjusted from the viewpoint of universal design (JIS Z9103). A comparison of the subjective evaluation of visual search time and ease of searching was made for the safety colors before and after the revision. The safety colors after the revision were evaluated as easier to find, although the visual search time became longer. The causes of this discrepancy and its relationship with traffic signs are discussed.

Research on the Improvement of Pedestrian Visibility for Drivers by Geometric Patterns Projection Lighting

Yoshiro Aoki･Yoko Kato･Michiaki Sekine (National Traffic Safty and Environment Laboratory)

Vehicle-to-pedestrian accidents still occur frequently at night, and effective measures to reduce them are needed. In this research, we investigated effectiveness of a technology that improves pedestrian visibility for drivers by projecting diamond-shaped patterns onto pedestrians from the vehicle’s headlamps. We conducted real-world driving experiments to measure the drivers’ pedestrian recognition distances with this geometric patterns projection lighting and compared the results with those obtained using conventional driving-beam and passing-beam.