How to Get APC Certification for NTD Reporting: A Step-by-Step Guide

For transit agencies using Automatic Passenger Counters (APCs), certification is a critical step in turning raw ridership data into compliant, reportable metrics.

But certification isn’t a one-time exercise. It’s an ongoing requirement tied to how and when APC data is used.

When Is APC Certification Required?

According to the NTD Sampling Manual, transit agencies must obtain APC certification in several scenarios:

• The first year APC data is used for NTD reporting
• Any mandatory recertification year (FY2022, FY2025, FY2028, etc.)
• Any year new or substantially different APC equipment is introduced

As noted by Dr. Xuehao Chu, developer of the NTD Sampling Manual and a qualified statistician for NTD reporting:

“You must meet this requirement of getting FTA certification for the first report year for which you use your APC data for NTD reporting, any mandatory recertification year … and any other year during which you install new and substantially different APC equipment.”

Understanding when certification is required is the first step. The next is navigating the process itself.

The 6 Steps to APC Certification

Achieving APC certification involves a structured, multi-step process designed to ensure data accuracy, statistical validity, and compliance with Federal Transit Administration (FTA) requirements.

1. Cleanse Raw APC Data

Raw APC data often contains inconsistencies, gaps, or anomalies.

To prepare it for reporting, agencies must apply a data cleansing methodology that:

• Meets NTD validation requirements
• Is consistently applied over a three-year reporting period
• Can adapt to special cases or service changes

This step lays the foundation for everything that follows.

2. Validate the APC Data

Once cleansed, the data must be validated.

The FTA requires agencies to demonstrate that APC data aligns with real-world conditions through a ride-check survey. The results of this survey must fall within a 5% variance of the cleansed APC data to be considered valid for reporting Unlinked Passenger Trips (UPT), Passenger Miles Traveled (PMT), or both.

3. Develop Expansion Methods

Not every trip will have complete APC data. Expansion methods are used to estimate ridership for:

• Vehicles without APC hardware
• Trips with missing or incomplete data

These methods help agencies accurately calculate key performance indicators such as:

• Monthly and annual UPT
• Annual PMT
• Average daily ridership by service type

4. Certify the Expansion Method

Expansion methods must be reviewed and approved by a qualified statistician.

This ensures that the methodology used to estimate ridership is statistically sound and capable of adapting to future service changes. Without this certification, estimated data cannot be confidently used for reporting or planning.

5. Implement Cleansing and Expansion Methods

Once approved, both the cleansing and expansion methodologies need to be implemented into your workflow.

Agencies may choose to:

• Manage the process manually using spreadsheets
• Use SQL scripts for more advanced data handling
• Leverage transit software to automate data processing

For many agencies, automation significantly reduces manual effort and ensures consistency across reporting cycles.

6. Maintain the APC System

Certification is not the end of the process.

Ongoing system maintenance is essential to:

• Identify and resolve hardware or data issues early
• Prevent data loss from faulty sensors or equipment
• Ensure continued compliance over time

Regular monitoring and proactive data management help preserve the integrity of your APC system long after initial certification.

Turning a Complex Process Into a Manageable One

APC certification is a detailed and often resource-intensive process. Each step requires careful execution, documentation, and validation to meet NTD and FTA standards.

For many agencies, the challenge isn’t understanding the steps. It’s consistently executing them while managing day-to-day operations.

That’s why more agencies are moving toward solutions that automate data cleansing, streamline validation, and support certified methodologies, reducing the manual burden while improving confidence in their reporting.

Simplify Your APC Certification Process

If you’re looking to reduce manual effort and accelerate your path to APC certification, the right tools can make a significant difference.

Explore how TransTrack’s APC Module helps agencies simplify data cleansing, validation, and NTD reporting:

→ Request a demo to see how it works in practice