Traffic jam request

vs | plus provides the option of a request in the event of a traffic jam to control the congestion on access lanes. With a so-called congestion loop, a request can be triggered with the help of the occupancy level. If this congestion loop is assigned to a special congestion traffic stream (traffic stream with higher priority and intervention type), it can be used to force a clearing due to the congestion.

A threshold for the start and a second for the end control this criterion. If the smoothed occupancy level of the specified detectors is between the two threshold values occupancy level ON (SPILLB_CALL_START) and occupancy level OFF (SPILLB_CALL_END), the request criterion is fulfilled. This criterion can be combined with the occupancy time criterion (OR link).


Flow control

No special congestion loops are used for flow control. A short loop at the stop bar is used to check whether vehicles are still travelling over it. Two parameter values are used for this purpose. Firstly, the gap is used to check when the last vehicle crossed the loop or the stop line. Secondly, the occupancy time is used to check whether vehicles are stationary for too long without being able to flow off.

If one of the two threshold values Congestion flow control: Occupancy gap (SPILLB_CALL_GAP) or Congestion flow control: Occupancy duration (SPILLB_FLOW_OCCT) is exceeded, the extension is set to inactive.


Discharge control

The discharge control is carried out with a hysteresis based on the detector measured value smoothed occupancy level. A threshold for the start and a second threshold for the end control this criterion. If the smoothed occupancy level of the specified detectors is between the two threshold values occupancy level ON (SPILLB_DISCHARGE_START) and occupancy level OFF (SPILLB_DISCHARGE_END), the discharge control is active. 

The discharge control is dependent on the detector function REDwJAM and EXTwJAM

  • If the detector function is set to REDwJAM (congestion red), the assigned traffic stream is set to red after the minimum duration 1 (tg min1). It remains red until either the congestion criterion disappears or the blocking time in red after congestion is exceeded. 
  • If the detector function is set to EXTwJAM (congestion extension), the extension of the assigned traffic stream is set to inactive. The traffic stream is cancelled according to other boundary conditions (red detection, frame signal plan, registration of not conflicting traffic streams); it can no longer actively extend.

If the detector function parameter is not specifically set to flow control (REDwJAM or EXTwJAM), flow control is active.


Display

Identifier

Values

Description

SPILLB_CALL_START

Spillback call: Occupancy degree at start


To control the tailback on access lanes, vs | plus provides the option of a request in case of congestion. With a so-called congestion loop, the occupancy level of a request can be triggered with the detector reading. If this congestion loop is assigned to a special congestion traffic stream (traffic stream with higher priority and intervention type), it can be used to force a clearing due to the congestion.






INAC

This evaluation is inactive.


1 .. 100

The occupancy rate is taken into account. Value in %.

SPILLB_CALL_END

Spillback call: Occupancy degree at end


To control the tailback on access lanes, vs | plus provides the option of a request in case of congestion. With a so-called congestion loop, the occupancy level of a request can be triggered with the detector reading. If this congestion loop is assigned to a special congestion traffic stream (traffic stream with higher priority and intervention type), it can be used to force a clearing due to the congestion.






INAC

This evaluation is inactive.


1 .. 100

The occupancy rate is taken into account. Value in %.

SPILLB_FLOW_OCCT

Spillback flow control: Occupancy time


To control the flow of a traffic stream, vs | plus provides flow control. No special congestion loops are used for flow control. A short loop at the stop line is used to check whether vehicles still cross it. Two parameter values are used for this purpose. On the one hand, the time gap is used to check when the last vehicle has crossed the loop or the stop line. On the other hand, the occupancy time is used to check whether vehicles are standing too long without being able to flow off.






INAC

This evaluation is inactive.


1 .. 3276

Occupancy time in seconds.

SPILLB_CALL_GAP

Spillback flow control: Occupancy gap 


To control the flow of a traffic stream, vs | plus provides flow control. No special congestion loops are used for flow control. A short loop at the stop line is used to check whether vehicles still cross it. Two parameter values are used for this purpose. On the one hand, the time gap is used to check when the last vehicle has crossed the loop or the stop line. On the other hand, the occupancy time is used to check whether vehicles are standing too long without being able to flow off.






INAC

This evaluation is inactive.


1 .. 32767

Occupancy gap in 1/10 of a second.

SPILLB_DISCHARGE_START

Spillback discharge control: Occupancy degree at start


The discharge control is performed with a hysteresis based on the detector measured value occupancy level. If the smoothed occupancy rate of the specified detectors is between the two threshold values START and END, the discharge control is effective. 

  • If the detector function is set to REDwJAM (congestion red), the assigned traffic stream is set to red after the minimum green time 1 (tg min1). It remains on red until either the congestion criterion disappears or the blocking time in red after congestion is exceeded.
  • If the detector function is set to EXTwJAM (congestion extension), the extension of the assigned traffic stream is set inactive. The traffic stream stops according to other boundary conditions (red detection, frame signal plan, registration of conflicting traffic streams), it can no longer actively extend.






INAC

This evaluation is inactive.


1 .. 100

The occupancy rate is taken into account. Value in %.

SPILLB_DISCHARGE_END

Spillback discharge control: Occupancy degree at end


The discharge control is performed with a hysteresis based on the detector measured value occupancy level. If the smoothed occupancy rate of the specified detectors is between the two threshold values START and END, the discharge control is effective. 

  • If the detector function is set to REDwJAM (congestion red), the assigned traffic stream is set to red after the minimum green time 1 (tg min1). It remains on red until either the congestion criterion disappears or the blocking time in red after congestion is exceeded.
  • If the detector function is set to EXTwJAM (congestion extension), the extension of the assigned traffic stream is set inactive. The traffic stream stops according to other boundary conditions (red detection, frame signal plan, registration of conflicting traffic streams), it can no longer actively extend.






INAC

This evaluation is inactive.


1 .. 100

The occupancy rate is taken into account. Value in %.


Parameter

from vs | plus version

Comment

Discharge control

6.2.5

As soon as a traffic stream has a switch-on command (state 9), a jam only takes effect when the traffic stream has green. A switch-on command is not cancelled by congestion. The switch-on command (state 9) is no longer cancelled during the phase transition in the event of a traffic jam. The TS receives its initiated green and closes after gmin1 if there is still congestion.

Discharge control REDwJAM

8.0.0

Allowed green duration in case of congestion: If a traffic stream has green and congestion, from vs | plus version 8.0.0 it is possible to define how long the green will be held.