When choosing the traffic light signal, please indicate one of the following systems:

- Autonomous system - every light colour stage is cyclically and punctually repeated, which means that every colour time is the same;

- Semiautomatic system - there is a main road that is also in green stage, except when some vehicle gets near the secondary road, or a person need to walk throught the crosswalk. When this happens, the seconday road starts a minimum green stage, that may extend depending on the amount of traffic or pedestrians of that road.

- Automatic system - there is no main road and no preferences for any road, meaning that the light colours change according to the general traffic amount of each road. Stage times are variable and the light colour changes only when there is moviment. There is a minimum and a maximum green time in each stage.

Click on the images for further details.