*3.5. Music Tempo*

Many people listen to music when they are driving. Studies show that music influences human behavior. In supermarkets, fast music causes customers to move faster through the store [87]. In bars, fast music makes people consume their drinks quickly [88]. The music tempo also causes an effect on the speed and accuracy of the tasks. In [89], fast music increased the rate and accuracy of mathematical computations in stock market environments. In driving, fast music also instigates the driver to drive faster [90]. However, in music, many parameters can affect the driver, such as the genre of music, instruments or volume, but the tempo is one of the most important in driving.

In the experiment, the participants listened to music through headphones. Drivers could adjust the volume according to their preferences to avoid discomfort. We created two playlists on Spotify [91]. One includes music with a slow tempo (65–71 bpm), and the other contains audio tracks with a fast tempo (155–188 bpm). Each of the participants was randomly assigned one of the two lists. Further, the song "Sonata for Two Pianos in D major" from Mozart was used to relax the participant at the beginning of the experiment. All songs were reproduced with the best sound quality that Spotify allows (OGG, 320 Kbps). In addition to the music, the drivers listened through headphones to the sound of the vehicle's engine.
