Calculating MAP-21 Performance Measures Using NPMRDS Data Chris Upchurch Wichita Area Metropolitan Planning Organization This is really the third in a trilogy. Two years ago in Las Vegas I talked about using the NPMRDS data for some of our local performance measures. Last year I talked about the MAP-21 performance measures in the proposed rule. This year we have a final rule. Some of these measures have changed significantly, and the NPMRDS has changed significantly with a new vendor so I thought it would be worthwhile to revisit the topic a third time.

MAP-21 System Performance Measures Using NPMRDS Data Level of Travel Time Reliability Interstate Non-Interstate NHS Truck Travel Time Reliability Peak Hours of Excessive Delay per capita Earlier this year FHWA released a final rule for the System Performance measures. Three of them use the NPMRDS data.

MAP-21 System Performance Measures Using NPMRDS Data Level of Travel Time Reliability Interstate Non-Interstate NHS Truck Travel Time Reliability Peak Hours of Excessive Delay per capita I’m only going to talk about the Level of Travel Time Reliability and Truck Travel Time Reliability. The Wichita region is not a non-attainment area, so I haven't really delved into Peak Hours of Excessive Delay.

MAP-21 System Performance Measures How many of you plan to calculate these yourselves?

MAP-21 System Performance Measures How many of you plan to calculate these yourselves? How many plan to hire a consultant or use off-the-shelf software?

MAP-21 System Performance Measures How many of you plan to calculate these yourselves? How many plan to hire a consultant or buy off-the-shelf software? How many haven’t made a decision? I'm hoping that what I have to say will be useful to all three groups.

What is NPMRDS? National Performance Management Research Data Set All of these measures rely on the National Performance Management Research Data Set or NPMRDS

What is NPMRDS? Travel time data for road segments Travel time data 5 minute time increments Covers the National Highway System Based on cellphone apps and in-vehicle navigation systems Travel time data Passenger vehicles Trucks All vehicles

What is NPMRDS Since February 2017 the NPMRDS data has been provided by the University of Maryland CATT Lab Data from INRIX Texas A&M Transportation Institute KMJ Consulting They have been more responsive than the previous NPMRDS vendor.

How many have downloaded NPMRDS data and looked at it?

How many of you have done something with NPMRDS data?

Tools for Calculating MAP-21 Performance Measures RITIS

NPMRDS Network “In theory there is no difference between theory and practice”

NPMRDS Network “In theory there is no difference between theory and practice, in practice there is.” – Yogi Berra

NPMRDS Network In theory: NPMRDS = NHS In practice NPMRDS ≠ NHS

NPMRDS Network Cross streets

NPMRDS Network Cross streets Ramps

Downloading the NPMRDS Data http://npmrds.ritis.org Massive Data Downloader

Downloading the NPRMDS Data RITIS Provides a lot of options for customizing your dataset when you download Customize your download or process the data after downloading?

Downloading the NPRMDS Data Geography By State or County Manual selection on map List of TMC codes Can save these for future reference

Downloading the NPRMDS Data Geography Create a download for all the relevant counties Download the GIS shapefile Edit the shapefile until I have only the TMCs I actually want Repeat for each network we’re interested in Interstate Non-Interstate NHS Use that list of TMCs to download the NPMRDS data

Downloading the NPMRDS Data Day of Week/Time of Day The final rule has 5 time periods Morning: 6am to 10am (weekdays) Midday: 10am to 4pm (weekdays) Afternoon: 4pm to 8pm (weekdays) Weekends: 6am to 8pm (weekends) Overnight: 8pm to 6am (all days of the week, freight measure only)

Downloading the NPMRDS Data Day of Week/Time of Day Can choose to download for any combination of days of the week or times of day You can just download the data in one of those time periods, but it’s not limited to the time periods defined in the rule.

Downloading the NPMRDS Data Day of Week/Time of Day Download 24/7 data and process later

Downloading the NPMRDS Data Type of Vehicle Passenger vehicles Trucks Trucks and Passenger vehicles None of the MAP-21 performance measures actually use travel times for just passenger vehicles, but it’s available.

Downloading the NPMRDS Data Type of Vehicle Passenger vehicles Trucks Trucks and Passenger vehicles

Downloading the NPMRDS Data Units of Time Minutes (to two decimal places) Seconds

Downloading the NPMRDS Data Units of Time Minutes (to two decimal places) Seconds

Downloading the NPMRDS Data Time Interval 5 minutes (“Don’t Average”) 10 minutes 15 minutes 1 hour

Downloading the NPMRDS Data Time Interval 5 minutes (“Don’t Average”) 10 minutes 15 minutes 1 hour

Tools for NPMRDS This is what it looks like when Excel breaks down and cries. The file is too big for Excel to open. For Kansas each month's file is about a gigabyte Excel will show you the first few thousand rows.

Tools for NPMRDS Statistical Tools Databases Custom software So you need some sort of specialized tool.

Level of Travel Time Reliability Metric For each TMC segment and time of day Divide: 80th Percentile Travel Time 50th Percentile Travel Time If a segment has a ratio of <1.5 for all time intervals it is considered reliable

Level of Travel Time Reliability Measure Sum for all reliable segments: Segment Length x Annual Volume x Occupancy Factor divided by Sum for all segments: Segment Length x Annual Volume x Occupancy Factor x 100 FHWA has not come out with occupancy factors yet. For the moment I am assuming that the occupancy factor in Wichita is one, which is pretty close to correct. If you are using one occupancy factor for your entire planning area it comes out in the wash anyway.

Truck Travel Time Reliability Metric For each TMC segment and time of day Divide: 95th Percentile Truck Travel Time 50th Percentile Truck Travel Time Remember we have one more time interval than we do for the LOTTR metric

Truck Travel Time Reliability Measure Total segment length x TTTR of the highest time interval divided by Total length of all segments FHWA has not come out with occupancy factors yet. For the moment I am assuming that the occupancy factor in Wichita is one, which is probably close to correct. If you are using one occupancy factor for your entire planning area it comes out in the wash anyway.

Summary Calculating these measures yourself gives you more control. RITIS download options can help make the calculations easier. Still need some sort of specialized software.

Thank You

Questions?