1. Director, Institute for Transportation Research and Education, North Carolina State Univ., Centennial Campus, Box 8601, Raleigh, NC 27695-8601 (corresponding author). E-mail: bastian_schroeder@ncsu.edu
2. Director VAMS Group & Commercial Vehicle and Safety, Institute for Transportation Research and Education, North Carolina State Univ., Centennial Campus, Box 8601, Raleigh, NC 27695-8601.
3. Research Associates, Institute for Transportation Research and Education, North Carolina State Univ., Centennial Campus, Box 8601, Raleigh, NC 27695-8601.