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An important part of driving many vehicles on layouts is to control behaviour and to prevent accidents. The more you can insert and drive at the same time the more impressive it shows up and the more complex it is to control.
The signals, signs, and sections (blocks) in GT-Command provides the very first and easy step to control your vehicles without making any physical sectioning or splitting or isolation of roads and tracks.
The concept of the position system implies that we know the exact position of any vehicle as well as any signal, sign, or section which the user has inserted on the screen. And due to that the track plan is in true geometry you can easily translate that position to the physical position on the layout. You do not need to have all signals and signs present physically, the virtual position on the screen is enough.
The first step in regulating your traffic is simply to insert signals, signs, and section on your layout drawing, and snap the signal directly to the track. When driving GT-Command calculates distances to all signals and signs ahead and modify speed in due time to obey the rules associated with that particular signal.
There is one important assumption. The system must be able to brake the vehicle in due time by reducing the speed steps. If you run DCC vehicles then set the CV 4 (Brake delay) value low and let the GPS-system make a speed calibration of your vehicles.
Some signal types:
a) Standard Red/Green signal: If green the vehicles pass, if red, the vehicle stops in front of the signal.
b) Normal 3 color signal, currently we do not use the yellow collor for early speed up or late braking.
c) Road or track signs, like Right away, Stop, speed control, road works, dangerous turn etc.
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If a standard signal Red/Green is inserted in a section or block then the vehicle will pass that section when signal is green. When the signal is red then the section is red as well and the vehicle will start braking in front of the red section and it moves slowly towards the signal. If the signal is still red it will stop there waiting until the signal (and the section) becomes green
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If a Right Away sign is inserted at a cross the vehicle will start looking to both sides when it is approaching the sign. If no veicles can influence the crossing it will just pass. However if there are vehicles in the zone on both sides which are close eough to influence the passing vehicles, then that vehicle will stop and wait until they have passed before it moves.
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If Dangerous Turn is ahead then the vehicles reduce speed to what is associated with ths particular sign, and when the turn is finished (measured by the position system), then it assumes the desired speed again.
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