Siemens Aktiengesellschaft

Suss Microtec Lithography Gmbh

Karin Fischer

Heinrich Brunner

Joseph Kramer

A method and a circuit arrangement for generating setting signals for signal generators of a traffic signal system, particularly of a street traffic signal system, upon employment of indications of time intervals between mutually hostile traffic flows contained in a time interval matrix are discussed. The time intervals are read from the time interval matrix for each entry signal group and subtracted from the greatest time interval value which greatest time interval value is reduced in value in cyclical succession. When this value is reduced to zero or, respectively, when a zero difference is determined in the course of the difference formations, then appropriate setting signals for the signal generators of the traffic signal system are emitted. In another embodiment provides that the time intervals of entry signal groups selected as being non-determinant for influencing a change of signal are first retained unchanged by a separate marking and are only made effective for reduction of their value in that case in which the non-marked entry time intervals of the entry signal groups hostile to the same clearing signal groups have elapsed. These techniques effect a controlled stoppage and initiation of traffic flow in accordance with specific intersection plans in a simple and precise manner.

Method and circuit arrangement for generating setting signals for signal

A method and apparatus for securing the intermediate protective time periods at an intersection in a street traffic signal system to provide adequate safety protection between respective traffic flows, in which, following the end of the duration of the green light time period of individual signal of the respective traffic flows to be independently controlled, the time elapsing thereafter, representing an actual time value, is totaled and compared with predetermined theoretical protective time values for traffic flows antagonistic to the green light signal to be connected, and upon attaining and/or exceeding the predetermined values, an associated connect command to said last-mentioned green light signal is released, and adding, at intervals somewhat smaller than those corresponding to the time rhythm of the traffic signal, all of said theoretical time values, thus forming an additional actual total time value, which is compared with a theoretical total time value therefor, and in the event an error is ascertained by said comparing operations, effecting corresponding safety precautions.

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Munich, Germany

Karin Fischer