1. Highway Capacity Manual (HCM);Transportation Research Board (TRB),2000
2. Percent Time-Spent-Following as a Performance Measure for Two-lane Highways;Luttinen,2001
3. Field Evaluation of Highway Capacity Manual 2000 Analysis Procedures for Two-lane Highways;Dixon,2002
4. The Development of an Analysis Method for the Determination of Level of Service of Two-lane Undivided Highways in South Africa;Van As,2003
5. A. Al-Kaisy, C. Durbin, Estimating percent time spent following on two-lane highways: field evaluation of new methodologies, in: Proc. of 86th Annual Meeting of Transportation Research Board, Washington, DC, 2007.