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This research investigates the feasibility of using smartphones as reliable instruments to
measure vehicle deceleration under different conditions and compares their accuracy and reliability
with traditional decelerometers. The research was conducted using a passenger vehicle (Audi A6
Avant) on different road surfaces—dry, wet, and gravel—at several speed intervals (30, 50, 70, and
90 km/h). The vehicle was equipped with an XL Meter decelerometer and three different
smartphones in different price ranges. Each device recorded deceleration data, which was then an-
alyzed to evaluate accuracy and reliability. The findings show that while the smartphones show
promising results on dry and gravel surfaces, their accuracy decreases at lower speeds and on wet
surfaces due to the limitations of the sensors in detecting subtle deceleration values. The research
also highlights that mid-range smartphones can perform comparably to higher-end models, sug-
gesting that excessive investment in more expensive technology may not be necessary for scientific
purposes. However, some differences in measurements are aributed to variations in device mount-
ing and orientation sensitivity. In conclusion, this research supports the potential of integrating
smartphone technology in vehicle testing for road safety, although it highlights critical limitations
that need to be addressed for standardized use.
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