Traffic stream in zone "Blocking"
The traffic stream status "Block traffic stream area" is assigned depending on the function of the message point and the preparation time parameter. This prevents traffic streams in conflict with the PT from being switched on. A message point of the "ASCPTxx" function sets the traffic stream status "Block traffic stream" if the PT is already so close to the stop line that no more stages can be advanced. A detector or message point of the "SCOPT" function can only set the traffic stream status "Block traffic stream".