1. Rural speed/flow relations;Duncan;TRRL Rep.,1974
2. A note on speed/flow/concentration relations;Duncan;Traffic Engng Control,1976
3. A further look at speed/flow/concentration;Duncan;Traffic Engng Control,1979
4. Speed/flow relations on recreational roads;Forsgate;TRRL Rep.,1974
5. Speeds on two-lane rural roads—a multiple regression analysis;Galin;Traffic Engng Control,1981