Driving-Speed-JND: stimuli and code for just-noticeable speed differences under ICEV, EV and silent interior noise

Audio-visual stimuli and software for a two-interval, two-alternative forced-choice (2AFC) study measuring the just-noticeable difference (JND) in driving speed under three interior-noise conditions (internal-combustion-engine vehicle, electric vehicle, and silence) at reference speeds of 40 and 100 km/h. Supplements SAE Technical Paper 2026-01-0671. This record contains both stimuli and a snapshot of the code, so the single DOI covers whichever part you use: Stimuli (CC BY 4.0): EV and ICEV cabin-sound recordings (WAV), the merged audio-visual clips, sample clips, and a stimulus-generation report. You may download the full video set, or only the audio plus sample clips and regenerate the rest with the scripts. Code (MIT): the MATLAB 2AFC adaptive-staircase experiment, the JND analysis, and the ffmpeg stimulus-generation scripts. The living code repository is on GitHub.