Signal control apparatus, signal control method and program

A signal control method, wherein a signal control apparatus connected to a plurality of traffic signals located on a road with a plurality of intersections having travel lanes with designated traffic classifications executes:

• detecting a number of vehicles staying in a travel lane or lanes of a same traffic classification among the travel lanes of the plurality of intersections;
• determining whether or not to extend or reduce signaling time for permitting traffic of a traffic classification of the travel lane or lanes based on the number of vehicles staying in the travel lane or lanes of the same traffic classification at the plurality of intersections;
• adjusting split of the plurality of traffic signals based on a result of the determination so as to extend or reduce the signaling time for permitting traffic of the traffic classification of the travel lane or lanes while maintaining offset being set for the plurality of traffic signals;
• determining respectively extending the signaling time for permitting traffic of the traffic classification of the travel lane or lanes in case a number of intersections at which the number of vehicles staying in the travel lane or lanes of the same traffic classification at the plurality of intersections respectively exceeds a predetermined second threshold, and exceeds a third threshold;
• and
• determining respectively extending the signaling time for permitting traffic of the traffic classification of the travel lane or lanes regardless of a comparison result with the third threshold in case the number of vehicles staying in the travel lanes of the same traffic classification among the plurality of intersection exceeds a fourth threshold that is greater than the second threshold.

A non-transitory computer readable medium storing a program, wherein the program causes a computer configuring a signal control apparatus connected to a plurality of traffic signals located on a road with a plurality of intersections having travel lanes with designated traffic classification to execute:

• detecting a number of vehicles staying in a travel lane or lanes of a same traffic classification among the travel lanes of the plurality of intersections;
• determining whether or not to extend or reduce signaling time for permitting traffic of a traffic classification of the travel lane or lanes based on the number of vehicles staying in the travel lane or lanes of the same traffic classification at the plurality of intersections;
• and
• adjusting split of the plurality of traffic signals based on a result of the determination so as to extend or reduce the signaling time for permitting traffic of the traffic classification of the travel lane or lanes while maintaining offset being set for the plurality of traffic signals;
• determining respectively extending the signaling time for permitting traffic of the traffic classification of the travel lane or lanes in case a number of intersections at which the number of vehicles staying in the travel lane or lanes of the same traffic classification at the plurality of intersections respectively exceeds a predetermined second threshold, and exceeds a third threshold;
• and
• determining respectively extending the signaling time for permitting traffic of the traffic classification of the travel lane or lanes regardless of a comparison result with the third threshold in case the number of vehicles staying in the travel lanes of the same traffic classification among the plurality of intersection exceeds a fourth threshold that is greater than the second threshold.