1. Graduate Research Assistant, Dept. of Transportation Engineering, Universidade Federal do Ceará, Campus do Pici–703, Pici, CE 60440-900, Fortaleza, Brazil (corresponding author).
2. Graduate Research Assistant, Dept. of Transportation Engineering, Universidade Federal do Ceará, Campus do Pici–703, Pici, CE 60440-900, Fortaleza, Brazil.
3. Assistant Professor, Dept. of Transportation Engineering, Universidade Federal do Ceará, Campus do Pici–703, Pici, CE 60440-900, Fortaleza, Brazil.
4. Associate Professor, Dept. of Civil Architectural and Environmental Engineering, Univ. of Texas at Austin, 301 E. Dean Keeton Stop C1761 Austin, TX 78712.