When ordering APS units from the manufacturer, practitioners will need to be specific concerning the features and settings that they desire or require. The level of detail required by the manufacturer varies depending on the company.

Elements of a specification sheet should inform the manufacturer of the characteristics of the location where the APS will be installed and which APS features will be required by the city or state. The following list contains suggested elements for a detailed specification sheet. APS units do not necessarily need to have all these features, but the practitioner should be sure to consider the appropriateness of all features and specify which ones are required for the selected APS installation.

It is also useful to include an intersection diagram showing:

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