Open Roads Speeds

Open Roads Speeds allows you to create an expression for routing based on open road-speed values:

Select Applications > Routing Tools > Settings.

In OS Open Roads data, the road links are classified in three ways with the values being held in: RoadClassification$, RoadFunction$ and FormOfWay$. The Routing Tools support the definition of a speed-based routing expression based on any of these.

When using the ‘Open Roads Speeds’ measurement option the route will be calculated using the classification and values shown in this section of the Settings dialog.

To include any road classification in the routing expression check the Use tickbox.

Sets of speeds can be saved as custom configurations. For instance to save a set of ‘Normal’ speeds, enter them in the road speed boxes and ensure the tickbox is checked.

Now enter a name in the box next to Save, e.g. Normal, and click Save. Any number of sets (configurations) can be saved.

To load a saved configuration, select it from the drop-down box and click Recall.

You will see the speeds displayed in the road classification boxes; they will be used by subsequent routing operations when you select Open Roads Speeds.

To edit a saved configuration, select it from the drop-down box and click Recall. Make the necessary changes, enter the same name of ‘Saved Speed Configuration’ and click Save. The new changes will simply be overwritten on the old configuration set.

To permanently delete a saved configuration display the name of the configuration in the Recall drop-down box and click Delete.

Click Show Open roads Expression to open the expression window.

You can copy this expression:

• into a text editor and customise it as an ‘Own expression’.
• into core SIS commands wanting an expression
• when using Workload Modeller

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