Inter Universities Research Center for Road Safety

Italy

Inter Universities Research Center for Road Safety

Italy

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Benedetto A.,Third University of Rome | Benedetto A.,Inter Universities Research Center for Road Safety | Calvi A.,Third University of Rome | Calvi A.,Inter Universities Research Center for Road Safety | And 2 more authors.
Advances in Transportation Studies | Year: 2011

Mobile phone use while driving is increasing among road users. Although the most of countries made illegal the cell phone use while driving, the drivers still use it both for calling and texting. Several studies investigated the distraction factors related to the use of mobile while driving and the effects on road safety. The main findings of these studies generally demonstrated an increasing of reaction time and decreasing of driving performance especially during not critical driving conditions, while the evaluation of the effects of mobile use during critical driving conditions is not so much investigates. The overall objective of this work is to contribute to the evaluation of the effects of the mobile phone use on driving safety. Specifically the effects of using cellular phone at the same time the driver is faced with making a critical stopping decision are investigated. The experiments are carried out using an interactive driving simulator. Three different road scenarios (urban road, rural road and motorway) are simulated. Thirty subjects take part to the experiments and drive four times each scenario: one time without calling (control scenario) and the other three times answering the calls by hand-held mobile, hands-free mobile and hands-free voice device. The driver's reaction time, the deceleration rate, the speed and the following distance are evaluated. The main effects of driving and calling are observed in the urban scenario, where the decreasing of driving performance is much more evident than in the rural and motorway scenario. Not significant differences on driving performances are found across the three telephone modes.


Benedetto A.,Third University of Rome | Benedetto A.,Inter Universities Research Center for Road Safety | Calvi A.,Third University of Rome | Calvi A.,Inter Universities Research Center for Road Safety | And 2 more authors.
Advances in Transportation Studies | Year: 2011

In this paper the authors present the first results of a study for analyzing the engineering problems in the design and improvement of a Formula 1 or competition circuit and for the optimization of the pilots' race performances. The authors have used a driving simulator. The physical and mechanical characteristics of the simulated vehicle have been improved in order to reproduce as possible a competition vehicle. For the tests we have simulated the urban circuit of Rome that has been recently proposed. The circuit is 6056 m long, the maximum longitudinal slope is 3.5% and the curve radii are between 8 and 400 m. The geometrical standards of the circuit are basically coherent with the Fédération Internationale de l'Automobile (FIA) regulations. Two professional pilots have been requested to drive for the tests. During the tests we have observed an average speed of the best lap compatible with the speeds observed in analogous urban circuits. After the tests the time histories of longitudinal speed, longitudinal and transversal acceleration have been post processed. Moreover the vehicle trajectory and lateral displacement have been analyzed on the average and in the case of the best lap. Finally the rate between used and available friction has been studied following a two dimensional approach. In particular three curves have been isolated as most critical being the rate between used and available friction over 0.80. These mentioned rates have been visualized on the maps so that the spatial distribution of used friction is in evidence.

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