Troubleshooting

Checking for Anomalies

Before starting analysing budget variations, we recommend doing some drill-down checks to ensure your model is performing as expected. While it is expected that there will be some edge-cases and anomalies in any network, there should not bee too many. The following checks are useful to flush out serious anomalies.

1. Segments Treated Too Often

Check your model to see if there are may segments that get treatments too often. A segment that gets a treatment every three years, for example, suggests that you need to tighten some thresholds in Candidate Selection.

Juno Cassandra Desktop has a tool that allows you to quickly find all segments with more than a certain number of treatments. To use this tool, to to the Debug menu and click on Elements with Too Many or Too Few Treatments.

For a 30 year modelling period, there should be few elements that have more than four treatments (taking rehabilitations with follow-up surfacings into account). For a 10-year modelling period, there should be few elements with more than two treatments. If you do find such elements, explore their modelling data in detail and make adjustments if needed.

2. Segments Never Treated

Check your model to see which elements are never treated. For a 10 to 20 year modelling period, it is not unusual to have a reasonable number of elements not treated. But you should still explore such elements (again use the Debug tool mentioned above) to ensure the results are reasonable.

3. Pre-Treatment Conditions

Juno Cassandra Desktop has a built-in tool that allows you to view the statistics of element condition in the year before treatment. To use this tool, go to the Debug menu and click on Pre-Treatment Statistics.

For example, you can use this tool to see the average value for Surface Age before Preservation treatments were applied, thereby allowing you to ensure this treatment class targets elements near the end of their expected surface life.

Or you can use the tool to check what the average PDI is for pavements that received Holding Actions or Rehabilitations.