1. PhD Student, Dept. of Water Res. Engrg., Tech. Univ. of Budapest, H-1111 Budapest, Müegyetem rkp. 1-3, Hungary. E-mail: ifulop@ bme.epito.hu
2. Prof., Dept. of Civ. Engrg., Univ. of Nebraska, W359 Nebraska Hall, Lincoln, NE 68588-0531. E-mail: ibogardi@unlinfo.unl.edu
3. Dir. of Information, Tech. and Information Services on Nat. Roads, H-1024 Budapest, Fényes Elek u. 7-13, Hungary. E-mail: gulyasandras@ mail.kozut.hu
4. Ministerial Counsellor, Ministry of Transport, Communication and Water Mgmt., H-1077 Budapest, Dob u. 75-81, Hungary. E-mail: csicsely@cms.khvm.hu