What are the PM3

The System Performance, Freight, and CMAQ measures (commonly known as PM3) are six measures related to various aspects of the transportation system:

• Percent of Person Miles of Travel on the Interstate System that is Reliable (Level of Travel Time Reliability - LOTTR)
• Percent of Person Miles of Travel on the Non-Interstate National Highway System (NHS) that is Reliable (Level of Travel Time Reliability - LOTTR)
• Truck Travel Time Reliability (TTTR)
• Peak Hour Excessive Delay (PHED)
• Percent Non-Single Occupancy Vehicle (Non-SOV) Travel
• Total Emissions Reductions (NOx and VOC)

Targets are established biennially for these measures as part of a four-year performance period, the second of which began in 2022. The PM3 page provides PM3 overviews for the State, MPOs, and counties.

Peak Hour Excessive Delay (PHED) - Person Hours

PHED measures the extra amount of time spent in congested conditions defined by speed thresholds that are lower than a normal delay threshold. For the purposes of this measure, the speed threshold is 20 miles per hour or 60 percent of the posted speed limit, whichever is greater. This measure multiples the total hours of delay by traffic estimates for each segment to determine vehicle hours. The measure is then multiplied by the federal vehicle occupancy estimate which is calculated by the Texas Transportation Institute (TTI) to determine person hours.

PHED is only federally mandated for CMAQ areas. The New York City UZA is currently the only area In New York State that is required to report PHED.

Level of Travel Time Reliability - LOTTR

LOTTR is a MAP-21 PM3 measure that looks at peak hour speed distributions for a given segment. LOTTR is a ratio calculation for each segment of road that takes the annual 80th percentile travel time for peak hours over the annual 50th percentile travel time for peak hours. Higher LOTTR values indicate that there is a wider gap in distribution of travel times between the 80th and the 50th percentiles. A wider gap (higher LOTTR score) means that delay during peak travel times is inconsistent and highly variable.

LOTTR is reported for two transportation networks Interstate, which are limited access segments (Functional Class 1) and Non-Interstate (Functional Classes 2-7).

Truck Travel Time Reliability - TTTR

TTTR is a MAP-21 PM3 measure that looks at peak hour speed distributions for a given segment. TTTR is a ratio calculation for each segment of road that takes the annual 95th percentile travel time for peak hours over the annual 50th percentile travel time for peak hours. Higher TTTR values indicate that there is a wider gap in distribution of travel times between the 95th and the 50th percentiles. A wider gap (higher TTTR score) means that delay during peak travel times is inconsistent and highly variable. TTTR is a more stringent reliability score than LOTTR to highlight the most highly variable segments that could impact freight delivery times.

Using the Tools

The PM3 tools are the simplest tools in the NPMRDS platform. They provide the ability to aggregate PM3 data at various geography levels (State, County, MPO, Urban Area, or NYSDOT Region). The PM3 Tools also provide two simple visualizations, a line graph showing the measure over time, and a set of tables.

Area Selection

View as Graphs or Charts

A radio button is located below the main chart on the upper third of the page which allows you to select between two formatting options for the lower two-thirds of the page: a set of graphs or a set of charts.

Graphs

Charts

Coming Soon