Using NPMRDS Data for System Performance

Using NPMRDS Data for System Performance

Using NPMRDS Data for System Performance Chris Upchurch Wichita Area Metropolitan Planning Organization MAP-21 System Performance Measures

Level of Travel Time Reliability Peak Hour Travel Time Ratio Truck Travel Time Reliability

Average Truck Speed 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 buy offthe-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 offthe-shelf software? How many havent made a decision? What is NPMRDS? National Performance Management

Research Data Set What is NPMRDS? Travel time data for road segments 5 minute time increments (epochs)

Covers the National Highway System Travel time data All vehicles Trucks How many have downloaded NPMRDS data and looked at it?

How many of you have done something with NPMRDS data? Tools for NPMRDS Tools for NPMRDS Statistical Tools Databases

Custom software Mismatches between the NHS and NPMRDS D is c r e p e n c ie s b e tw e e n F u n c tio n a l C la s s ific a tio n a n d N P M R D S Legend

F u n c tio n a l C la s s ific a t io n - P r in c ip a l A r t e r ia ls a n d H ig h e r R o a d w a y s in N P M R D S n o t c la s s if ie d a s P r in c ip a l A r t e r ia ls o r H ig h e r Level of Travel Time Reliability Divide: 80th Percentile Speed 50th Percentile speed

If a segment has a ratio of <1.5 it is considered reliable Measure: Percentage of reliable mileage Level of Travel Time Reliability: Handling Missing Data For epochs with missing data, use the posted speed limit for that segment

Speed limits often change within a travel segment Level of Travel Time Reliability: When to look at Weekdays: 6 am to 10 am 10 am to 4 pm

4 pm to 8 pm Weekends: 6 am to 8 pm Calculate each time period separately All four time periods must be reliable for the segment to be considered reliable

Level of Travel Time Reliability: Geography Interstates within the MPO boundary Non-Interstate NHS within the MPO boundary Peak Hour Travel Time Ratio Define a desired travel time for each segment

Divide: Desired travel time Actual travel time If a segment has a ratio of <1.5 it is meets expectations Measure: Percentage of mileage that meets expectations

Level of Travel Time Reliability: Handling missing data Ignore epochs with no data Level of Travel Time Reliability: Outliers Remove epochs with travel speeds:

Below 2 mph Over 100 mph Peak Hour Travel Time Ratio: When to look at Weekdays only Exclude federal holidays Six 1-hour segments

6-7am, 7-8am, 8-9am, 4-5pm, 5-6pm, 6-7pm Calculate the ratio between desired and actual for each hour Select the hour with the highest average Level of Travel Time Reliability: Geography

Only urbanized areas with a population over 1 million Interstates within the Urbanized Area Boundary Non-Interstate NHS within the Urbanized Area Boundary Truck Travel Time Reliability

Divide: 95th percentile travel time 50th percentile travel time If a segment has a ratio of <1.5 it is considered reliable Measure: Percentage of reliable mileage

Truck Travel Time Reliability: Handling missing data For epochs with missing data: Use "all vehicle" travel times if available If not, use the posted speed limit for that segment Truck Travel Time Reliability: When to look at

24/7/365 Travel Time Reliability: When to look at Interstate System within the MPO Boundary Average Truck Speed Calculate the average struck speed over the

year If the average speed is over 50mph the segment is uncongested Measure: the percentage of the system uncongested Average Truck Speed: Handling missing data

For epochs with missing data: Use "all vehicle" travel times if available If not, use the posted speed limit for that segment Average Truck Speed: When to look at 24/7/365

Average Truck Speed: Geography Interstate System within the MPO Boundary Missing Data Level of Travel Time Reliability Use posted speed limits

Peak Hour Travel Time Ratio Ignore epochs with no data Truck Travel Time Reliability Substitute "all vehicles" time

Otherwise, use posted speed limit Average Truck Speed Substitute "all vehicles" time Otherwise, use posted speed limit

Outliers Level of Travel Time Reliability Peak Hour Travel Time Ratio Truck Travel Time Reliability

Average Truck Speed Remove time periods <2mph or >100mph When to look at Level of Travel Time Reliability

Truck Travel Time Reliability 6-10am, 10am-4pm, 4-8pm, Weekends 6am-8pm All must be reliable 6-7am, 7-8am, 8-9am, 4-5pm, 5-6pm, 6-7pm Look at the hour with the

highest average 24/7/365 Average Truck Speed 24/7/365 Peak Hour Travel Time Ratio

Geography Level of Travel Time Reliability Interstates within the MPO boundary Non-Interstate NHS within the MPO boundary

Peak Hour Travel Time Ratio Interstates within the Urbanized Area Boundary > 1 million Non-Interstate NHS within the Urbanized Area Boundary > 1

million Truck Travel Time Reliability Average Truck Speed Interstates within the MPO boundary

Thank You Questions?

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