Traffic stream in zone "Main request"
The traffic stream status "Traffic stream in main request area" is assigned depending on the function of the message point and the preparation duration parameter. This activates switching on the PT stage. Detectors with the "SCIPTxx" function trigger a main request after the delay time has elapsed. They thus assign the traffic stream status "Traffic stream in the main request area". vs | plus calculates the expected arrival second from the main request and leaves the current traffic streams at a standstill until the change to PT must be initiated in good time (intergreen times just reach the expected arrival second).