1. CELL PHONE USAGE WHILE DRIVING INFLUENCE ON DRIVER'S REACTION TIME Igor Milanović dr Željko Ranković mr Aleksandar Gošić

2. Contents  Cell phones – necessity, but often used while driving.  Four sort of distraction: visual, auditory, physical and cognitive.  Vast number of cell phone’s functions.  Distraction of driver’s attention.  Even 50% of drivers use cell phone while driving.

3. Key results  Reaction time meter Multihrono 803,  20 drivers, each 15 tests,  Limit reaction time 0,540 s and less than 3 mistakes,  Average age 23-40 years, driver experience 4-21 years,  Time measured with no usage, then with usage of cell phone.

4. Discussion  Statistical analysis by IBM SPSS Statistics 19.0. SPSS.  Reaction time with no usage of cell phone – mean is 0.465 s, standard deviation is 0.067. Reaction time with usage of cell phone – mean is 0.692 s, standard deviation is 0.141.  Median value of reaction time increased by 0.213.  Test of normality: Kolmogorov-Smirnov and Shapiro-Wilk.  Paired-Samples T test is used for assessing null hypothesis.

5. Conclusion  Average increased reaction time by 0.213 s.  Drivers could have expected that they will get signal to react.  Drivers who have not used cell phones made 49 mistakes (2.45 each driver), otherwise drivers who have used cell phones made 61 mistakes, or 3.05 each driver.  Cell phones have negative influence on drivers while driving.

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