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The article focuses on the report of the fourth international symposium on the theory of traffic flow, that was held in Karlsruhe, Germany, in June, 1968. The symposium was attended by 154 participants from all over the world. Here, authors present brief comment on each paper discussed in the symposium. The paper entitled "A Study of Driver-Aided Car Following," by R. E. Fenton and W. B. Montano described recent experiments with a car controlled by a control, stick with a finger presenting a built-in kinesthetic tactile aid to the driver. The paper entitled "On Some Theoretical Traffic Problems" by J. Gustavsson, dealt with two topics, the asymptotic average speed of a vehicle on a long journey, and numerical examples illustrating the author's model for overtaking on a two-lane road. "An Analysis of Delays to Vehicle Platoons at Traffic Signals," by R.E. Allops examined the problem of the delay to a traffic platoon at an unsaturated traffic signal, the theoretical result being expressed in terms of the arrival pattern and duration of the platoon and the arrival time of the leading vehicle.