[1. Everitt, B. Cluster Analysis Heinemann Educ. London, Books, 1974.]Search in Google Scholar
[2. EURAMP Project. Deliverable D3.5. Safety Critical Issue for Ramp Metering. European Commission, Brussels 2006.]Search in Google Scholar
[3. Glob, F. T., W. W. Recker. A Method for Relating Type of Crash to Traffic Characteristics on Urban Freeway. - Transportation Research. Part A. Vol. 38, 55-80.10.1016/j.tra.2003.08.002]Search in Google Scholar
[4. Abdel- Aty, M., A. Pand e. Identifying Crash Propensity Using Specific Traffic Speed Conditions. - Journal of Safety Resaerch, Vol. 36, 2005, 97-108.10.1016/j.jsr.2004.11.00215752487]Search in Google Scholar
[5. Lee, C., B. Hellinga, F. Saccomanno. Evaluation of Variable Speed Limits to Improve Traffic Safety. - Transportation Research, Part C, Vol. 14, 2006, 213-228.10.1016/j.trc.2006.06.002]Search in Google Scholar
[6. Sale m, H. H., C. Ramananjoana, J. P. Lebacque. Risk Index Model for Real-Time Prediction of Potential Traffic Crash on Urban Motorway. - In: Proccedings of EWGT’2006. Advances in Traffic and Transportation Systems Analysis, BARI, Italy, 2006.]Search in Google Scholar
[7. Dilmore, J. Implementation Strategies for Real-Time Traffic Safety Improvement on Urban Freeways. MA Thesis, University of Central Florida, Orlando, 2005. ]Search in Google Scholar