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​​​​Traffic Information

In its mission to maintain Pennsylvania's transportation system, PennDOT monitors traffic information, provides traffic and Geographic Information Systems resources for partners and stakeholders, and much more. The department also facilitates safe Traffic Counting across the state.

Highway Statistics

2022 Highway Statistics

2021 Highway Statistics

2020 Highway Statistics

2019 Highway Statistics

2018 Highway Statistics

National Highway System (NHS)

NHS Maps

Statewide NHS Map (PDF)

NHS Revision Letter Template (PDF)

Functional Classifications

County Functional Class Maps

Functional Classification Letter Template (PDF)

Traffic Data

2023​ Pennsylvania Traffic Data

2022 Pennsylvania Traffic Data

2021 Pennsylvania Traffic Data

2020 Pennsylvania Traffic Data

2019 Pennsylvania Traffic Data

Frequently Asked Questions

What are traffic counts used for?

Traffic information is critical in transportation decision making related to highway funding, traffic engineering, highway design, planning, programming, and air quality analysis.

When is traffic count data collected?

PennDOT has an established program for collecting traffic data. Traffic data is collected at approximately 40,000 sites statewide. The sites are on various collection cycles: annually, every three or five years, depending on priority of the highway system. More than 10,000 traffic counts are taken each year at selected locations.