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2. Hobbs, F.D.: Traffic planning and engineering. Pergamon Press, Oxford (1989)
3. Aparicio, F., Arenas, B., Gómez, A., Jiménez, F., López, J.M., Martínez, L., Páez, F.J.: Ingeniería del Transporte. Dossat, Madrid (2008). in Spanish
4. Project PREVENT http://www.prevent-ip.org/ (accessed on February 2011)
5. EEVC WG 19. Primary and secondary safety interaction. EEVC (2004)