Adrian TODORUŢ, Nicolae CORDOȘ, István BARABÁS, Monica BĂLCĂU


This paper assesses from the mathematical point of view the pre-collisions velocities and the distance traveled by car in the braking process, surprised by physical models. For evaluating these quantities are take into account: the number and length of skid mark; type of braking system; nature and condition of the road; the longitudinal inclination of the road; state of the driver. For different longitudinal gradients of the road and the different states of the driver - he is expecting for danger; he is not previously approved by the possible accidents, having a normal behavior in situations requiring immediate danger; circulating during sunrise and twilight - the obtained results surprise the initial velocity variations on the delay time of braking phases, given as wheel lock and brake effective and on this basis is used to assess total stop area by perception-reaction time of the vehicle driver, surprising the perception-reception-reaction phase in the braking process which depends exclusively on state driver. Working algorithm developed allows changing the input data and obtain results with graphical interpretation for different states of the driver and vehicle operating in various situations that facilitate the assessment and comparison of different conditions studied.

Key words: vehicle, braking process, breaking skid marks, speed, calculation algorithm

Full Text:



Balaci, C., Stabilirea vitezei de circulaţie în unele situaţii particulare. În: Expertiza Tehnică, nr. 22, Vol. 2, pg. 35-41. Simpozionul: Actualitatea în expertiza tehnică, Sinaia, 1995.

Brach, Raymond M.; Brach, R. Matthew, Vehicle Accident Analysis and Reconstruction Methods, Second Edition. Warrendale, PA, SAE International, 2011, ISBN 978-0-7680-3437-0.

Donald E. Struble. Automotive Accident Reconstruction: Practices and Principles (Ground Vehicle Engineering Series). Editura CRC Press, Taylor & Francis Group, LLC, 2014, ISBN-13: 978-1-4665-8837-0.

Gainginschi, R.; Filip, I., Expertiza tehnică a accidentelor rutiere. Bucureşti, Editura Tehnică, 2002.

Gaiginschi R., ş.a., Siguranţa circulaţiei rutiere, Vol. II. Bucureşti, Editura Tehnică, 2006.

Gaiginschi, R., Reconstrucţia şi expertiza accidentelor rutiere. Bucureşti, Editura Tehnică, 2009.

Lepădatu, M.; Sándor, G., Conducerea preventivă. Miercurea-Ciuc, Editura Institutul de formare profesională în transport rutier, 2008.

Nistor, N.; Stoleru, M., Expertiza tehnică a accidentului de ciculaţie, BucureȘti, Editura Militară, 1987.

Todoruţ, A., Bazele dinamicii autovehiculelor. Algoritmi de calcul, teste, aplicaţii. Cluj-Napoca, Editura Sincron, 2005.

Todoruţ, A., Dinamica accidentelor de circulaţie. Cluj-Napoca, Editura U.T.PRESS, 2008.

Todoruţ A., Barabás I., Evaluarea distanţei de siguranţă dintre autovehicule la desprinderea din coloană, în vederea depăşirii (Evaluating the safety distance between vehicles when initiating the overtake). În: Ştiinţă şi Inginerie, Vol. 20, pg. 529-538. Bucureşti, Editura AGIR, 2011, ISSN 2067-7138, e-ISSN 2359-828X.

Todoruţ, I.-A.; Barabás, I.; Burnete, N., Siguranţa autovehiculelor şi securitatea în transporturi rutiere. Cluj-Napoca, Editura U.T.PRESS, 2012.

Todoruţ, I.-A.; Barabás, I.; CordoȘ, N.; Moldovanu, D.; Bălcău, Monica (2014). The evaluation of kinematic measures within the process of overtaking motor vehicles. În: 3rd AMMA International Congress “Automotive, Motor, Mobility, Ambient” - AMMA 2013, 17-19 October 2013. Paper Identification Number: AMMA2013_412, http://amma2013.utcluj. ro/images/program.pdf. Published - Acta Technica Napocensis - Scientific Journal of Technical University of Cluj-Napoca, Series Environmental Engineering & Sustainable Development Entrepreneurship (EESDE), Special Edition AMMA 2013, Volume 3, Issue 1, Special Edition (January – March 2014), pg. 29-44, ISSN: 2284-743X; ISSN-L: 2284-743X, U.T. Press Publishing House Cluj-Napoca, http://cpaddd.utcluj.ro/fileadmin/Revista_


Untaru, M.; ş.a., Dinamica autovehiculelor pe roţi. Bucureşti, Editura Didactică şi Pedagogică, 1981.

Untaru, M.; ş.a., Dinamica autovehicule¬lor. Braşov, Universitatea din Braşov, sectorul Reprografie U02, 1988.

Bosch Automotive Handbook,

th Edition, Robert Bosch Gmb, 2004, Plochingen, Automotive Equipment Business Sector, Department Product Marketing Diagnostics & Test Equipment (AA/PDT5), Distribution Bentley Publishers 1734 Massachusetts Avenue Cambridge, MA 02138, USA.


  • There are currently no refbacks.