Impact of Permitted Driving Speed on the Design of Urban Street Network in Latvia

Ziedonis Lazda, Juris Smirnovs


Today, an increasing number of necessary infrastructural measures is encountered the purpose of which is to assist in managing the traffic speed thus forming the most important part in speed management policies. This paper reviews the choice of permitted driving speed depending on the defined street category. The existing norms that define road functions and categories for the urban street network in Latvia are evaluated. This paper stresses the need to review the functional classification of the road network with specific attention paid to the importance of each road type and their influence on the drivers’ choice of adequate driving speed. A practical study on the efficiency of the chosen road profile (number of lanes, median, etc.) and design parametres (width of driving lanes, longitudinal curvature radius, horizontal curvature radius, etc.) in the existing street network has been performed.


road functions; road categories; permitted driving speed; road profile; design parameters

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Antov, D.; Abel, K.; Sürje, P.; Rõuk, H.; Rõivas, T. 2009. Speed Reduction Effects of Urban Roundabouts, The Baltic Journal of Road and Bridge Engineering 4(1): 22–26. doi:10.3846/1822-427X.2009.4.22-26

Cameron, M. H.; Elvik, R. 2010. Nilsson’s Power Model Connecting Speed and Road Trauma: Applicability by Road Type and Alternative Models for Urban Roads, Accident Analysis & Prevention 42(6): 1908–1915. doi:10.1016/j.aap.2010.05.012

Hauer, E.; Ahlin, F. J.; Bowser, J. S. 1982. Speed Enforcement and Speed Choice, Accident Analysis & Prevention 14(4): 267–278. doi:10.1016/0001-4575(82)90038-0

Ratkevičiūtė, K.; Čygas, D.; Laurinavičius, A.; Mačiulis, A. 2007. Analysis and Evaluation of the Efficiency of Road Safety Measures Applied to Lithuanian Roads, The Baltic Journal of Road and Bridge Engineering 2(2): 81–87.

Lama, A.; Smirnovs, J.; Naudžuns, J. 2006. Road Traffic Safety in the Baltic States, The Baltic Journal of Road and Bridge Engineering 1 (1): 63–68.

Lazda, Z.; Smirnovs, J. 2009. Evaluation of Road Traffic Safety Level in the State Main Road Network of Latvia, The Baltic Journal of Road and Bridge Engineering 4(4): 156–160. doi:10.3846/1822-427X.2009. 4.156-160

Lazda, Z.; Smirnovs, J. 2011. Research on Traffic Flow Speed of Arterial Streets in Urban Areas, in Proc. of the 8th International Conference “Environmental Engineering”: selected papers, vol. 3. Ed. by Čygas, D.; Froehner, K. D. May 19–20, 2011, Vilnius, Lithuania. Vilnius: Technika, 936–941.

Žilionienė, D.; Oginskas, R.; Petkevičius, K. 2010. Research, Analysis and Evaluation of Roundabouts Constructed in Lithuania, The Baltic Journal of Road and Bridge Engineering 5 (4): 240–245. doi:10.3846/bjrbe.2010.32

DOI: 10.3846/bjrbe.2011.36


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