DOI: 10.15787/vtt1/pr2f9x
title: Pedestrian External Display Motion Judgment Data

description: Project Description: This dataset supports two controlled test track experiments conducted on the Surface Street section of the Virginia Smart Roads in Blacksburg, VA. Data collection for experiment 1 occurred in 2022, and Experiment 2 was completed in 2023. The primary objective of both experiments was to evaluate whether a front-mounted external LED lighting display installed on a passenger vehicle improved pedestrians' ability to identify the vehicle's motion state (accelerating, decelerating or maintaining a constant speed). Experiment 1 also looked at how different levels of instructional exposure influenced any improvements to pedestrian perception, and Experiment 2 looked at whether pedestrian judgement improvements impact pedestrian crossing decisions. Data Scope: The dataset contains two worksheets corresponding to the two experiments: Experiment 1: Total Observations: 1930 trials Unit of analysis: individual participant motion-state judgments per trial Design: Within-subject manipulation of display condition, mixed exposure to instructional prompts, and time of day between subjects Each participant completed 30 trials 10 with display off 10 with static display 10 with fluctuating display All participants completed the first 15 trials without instruction regarding display meaning (No Prompt) For the remaining 15 trials, participants were assigned to either Indirect Prompt condition Explicit Prompt Condition Each trial includes participant motion-state judgment and the corresponding actual vehicle maneuver. Experiment 2: Total Observations: 480 trials Unit of analysis: individual participant motion-state judgments and crossing-related measures per trial Participants completed 6 trials with display off 18 trials with display active Each trial includes: Motion-state judgment Confidence rating Time to vehicle pass Calculated safety buffer Pedestrian safety buffer is defined as the elapsed time between when the participant decided they would no longer consider it safe to cross, and when the vehicle passed their location. Confidence rating Experiment 1 had 1930 observations (participant judgements of vehicle motion). Each of the participant judgements was compared against what the vehicle was actually doing. All participants completed the first half of the experiment with no verbal instructions regarding the display (no prompt), and half way through half of participants were given basic information about the display (indirect prompt), and the other half were given more exact information about the display (explicit prompt). All participants were experienced 30 trials, with 10 each of the display off, fluctuating display, and static display conditions. Experiment 2 had 480 trials, each with their judgment of vehicle motion, as well as their crossing decision time, defined as the amount of time between when participants decided they would no longer be able to safely cross and when the vehicle passed (noted in the data as time to vehicle pass), as well as their buffer time (difference of their average time to actually cross the road and when the approaching vehicle passes). Data Specification: Please see the attached Data Specification document for additional information.