Speed control

Definition

The “Space mean speed above limit” violations occurs if the car's space mean speed V calculated as ...

V=D/(T₂ - T₁)

... appears above the limit V_max with account for a user-defined permissible tolerance ΔV, as the diagram below illustrates.

Here:

• D is assumed known.
• T₁, T₂ are the time stamps of the car's Focal point crossing the “Speed control: Start” and “Speed control: End”  lines. They are reported as the attributes of the line crossing events detected by CarTrack Pro on the cameras watching these lines.

Steps to set up illegal stop/ parking control

1. Build a road object, which might not be a crossroads for this violation type but a linear road segment (e.g. its name is “Broadway segment”). An already existing road object can also be used at steps 2 — 7.
2. Bind cameras to it.
3. Name the violation.
4. Build the “Speed control: Start” and “Speed control: End”  lines in CarTrack Pro settings on the camera meant to monitor these lines.
5. Link the violation name (step 3) to the “Speed control: Start” and “Speed control: End”  lines (step 4).
6. Turn on speed control.
7. Review the results.

Bind cameras to road object

Detection of an illegal stop/ parking requires cameras that monitor the no stop/ parking area. It must have CarTrack Pro enabled.

1. In the Road objects sections of the settings, click the road object name as shown ...




... to open the next screen:




2. Set the camera filter to All to find the camera intended to monitor the “Speed control: Start” and “Speed control: End”  lines on the camera list, then run Bind to road object in the three-dot menu.

A window with the same name will open.




3. Check the Average speed under Camera type. 
4. Enter the camera label, which will appear wherever it is relevant to this kind of violation.

Let the label be clear and self-explanatory, e.g. “Line monitoring”.

5. Select a color for the camera icon on the road object diagram.
6. Click Bind.
7. Drag and drop the camera icon on the road object diagram to place it where it is physically located.
8. Redraw the camera’s field of view on the diagram to represent it realistically.
9. Optionally, bind an overview camera in the same way, which, however, con be combined as one.

Name the violation

On the Violation name page in the settings, click the “+” to open a window, then:

1. Set Violation type to “Space mean speed above limit”.
2. Set an event priority value (e.g. “Critical” if the speed limit is 100).
3. Type a clear, descriptive name for the planned violation, e.g., “Speeding above 100”.

Build the speed control lines

Build the “Speed control: Start” and “Speed control: End”  lines in CarTrack Pro settings on the camera meant to monitor these lines. Give these lines clear self-explanatory names, e.g., “Start line” and “End line”.

Link the violation name to the speed control lines

Now let a violation of the “Illegal stop/ parking” type in the “No stop/ parking” area get its name. To do so:

1. On the road object page, click Violation rules in the three-dot menu — the screen will show:




1 — the road object name given at step 2 in “Road objects”
2 — bound camera label assigned at step 4 in “Bind cameras to road object”.
3 — bound camera type assigned at step 3 in “Bind cameras to read object”. 
4 — the list of traffic objects (their names and types) created on the camera needed to build a rule (the “Start line” in this case).
5 — traffic object name given at step 3 in “High speeding”.
6 — traffic object type defined at step 2 in “High speeding”. 
7 — planned traffic violation name to be given at step 2 in this section below.
8 — traffic violation type.

2. In the Speed control segment, select the “Speed control: End” line labeled “End line” as shown.
3. Enter the speed control segment length value, which we assume known.




4. Enter the speed limit and tolerance value into the respective fields.
5. Optionally, specify the cameras overviewing the speed control start and end.
6. Click Save.

Turn on speed control

Run Turn on control in the three-dot menu on the road object page to check Crossroads crossing in the window that opens, and then click Turn on.