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Condition Improvement defines the what PIs are affected by the selected treatment. After inserting a new improvement item, this column provides a drop-down list that contains all condition attributes that change according to a performance model. These condition attributes are columns in Network Master and have the “Deteriorates” column selected in the Setup PMS Analysis Columns window (i.e., attributes with these check boxes checked are considered “Performance Index” in PMS).

Condition Improvement

Condition improvement is controlled using a groovy script. This column shows the name of the Groovy script that determines the “condition improvement” estimate. The script is selected from a drop-down list, the contents of which are configured in the Groovy Scripts window under the Condition Improvement type of Groovy script.

Note: Rather than editing a script in the Groovy Scripts window, you can instead modify a script by clicking the name, which then displays the Edit Groovy Script dialog box.

Future Deterioration Type

This parameter determines how the improved performance will deteriorate after the improvement. It contains a drop-down list with the following deterioration options listed and graphed below:

  • New PC Model: A new deterioration model for the condition attribute that deteriorates is applied based upon the model selected using the Default Model Structure window's decision tree. This is what is used most of the time.
  • Section Model If Exists, Otherwise New PC Model: If there is a specific deterioration model for this section, then, after treatment, it will be used; otherwise, the model selected using the Default Model Structure window's decision tree will be used. Note: Section models are always used during the first years of analysis prior to treatment. The same section model will continue to be used after treatment if you select this option.
  • Increases Index RSL by N Years: For the condition attribute, after treatment and improvement, the deterioration is set based upon the model selected using the Default Model Structure window's decision tree, but the model's coefficients will be automatically adjusted to extend the life of the road section by N years (based upon the RSL threshold as defined in the Performance Models window). This life extension is over and above the life extension due to the improvement itself. (The value of N is either set directly in the Effective for Years column or results from the Groovy script specified in the Groovy Script for Number of Years column.)
  • Improvement Deteriorates in N Years: For the condition attribute, after treatment and improvement, the deterioration is set to return to the "before treatment" model after N years after which the "before treatment" model is used.  (The value of N is either set directly in the Effective for Years column or results from the Groovy script specified in the Groovy Script for Number of Years column.)
Note:  For those treatments with a future deterioration type of either Improvement Deteriorates in N Years or Increases Index RSL by N Years (as set in the Future Detr Type column in the Improvements pane), the value in this column indicates how long the improvement in condition should last until the condition returns to that experienced by the pavement section (according to its underlying performance model). The graph below shows how these years are applied to a maintenance treatment.

Effective for ... Years

This parameter specifies the N value for the two future deterioration types “Increases Index RSL by N Years” and “Improvement Deteriorates in N Years” is determined. If the Groovy Script for Number of Years column is null, the system uses the value entered in this column directly for the N value. (If the Groovy Script for Number of Years column is not null, the N value from the Groovy script overrides any value entered in this column.)

Groovy Script for Number of Years

This parameter specifies how the N value for the two future deterioration types Increases Index RSL by N Years and Improvement Deteriorates in N Years is determined. When a script is selected in this column, the system uses it to calculate the N value (and ignores the Effective for … Years column).

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