1. 1) Highway Capacity Manual 1965, Special Report 87, TRB, National Research Council, Washington D. C., 1965.
2. 2) Highway Capacity Manual 1985, Special Report 209, TRB, National Research Council, Washington D. C., 1985.
3. 3) Highway Capacity Manual 1994, Special Report 209, TRB, National Research Council, Washington D. C., 1994.
4. 4) Under-wood, R. T.: Traffic flow and bunching, J. Aust. Rd Resl, pp. 8-25, 1963.
5. 5) Daou, A.: On the flow with platoon, J. Aust. Rd Res, pp. 4-13, 1966.