1. HPMS Traffic Data Review Highway Information Seminar Oct 22 - 25, 2012 Patrick Zhang, P.E. 202-366-1941 Office of Highway Information Policy, FHWA 1

2. Review Objective The HPMS traffic data review is to ensure quality and consistent data from all State highway agencies. 2

3. Key Processes Currently Used  Roadway link/segment level traffic data – GIS tools  Statewide summary level – Database and Trend 3

4. Vehicle Miles Travelled by Roadway Types Data Sources 1: HPMS Statewide Summaries – daily VMT for rural minor collectors, rural locals, and small urban locals 2: HPMS Urban Area Summaries – urban local daily VMT 3: All Others – AADT x length of roadway segment - Full Extent Data State total = 1 + 2 + 3 4 State Level VMT Data

5. Example - State VMT 5 Example - CT 2010 Annual VMT in Million Miles 1 - Interstate 2 - PA - Other Freeways 3 - PA - Other 4 - Minor Arterial 5 - Major Collector 6 - Minor Collector7 - Local Rural 711 333 470 500 938 156 794 Urban 9,633 3,887 3,646 5,091 2,586 21 2,528

6. Example - Compare to the last year 6

7. Example - VMT changes by roadway types VMT Percentage Changes from 2010 by Roadway Types RURAL INTERSTATE OTHER PRINCIPAL ARTERIAL MINOR ARTERIAL MAJOR COLLECTOR MINOR COLLECTORLOCALTOTAL -0.51%-2.37%-2.74%4.76%-1.51%-1.53%-0.68% URBAN INTERSTATE OTHER FREEWAYS OTHER PRINCIPAL ARTERIAL MINOR ARTERIAL MAJOR COLLECTORLOCALTOTAL -1.32%15.49%3.65%2.88%13.78%0.77%2.86% Grand TOTAL 1.17% 7

8. Example – State VMT Historical Trends by Roadway types 8 1Rural Interstate2Other Rural Arterial3Other Rural 4Urban Interstate5Other Urban Arterial6Other Urban NANational AverageRARegional Average10=2010

9. VMT by Vehicle Types 6 Vehicle Types Motorcycle, Passenger Car, Light Truck, Bus, Single Unit Truck, Combination Truck 6 Roadway Types 3 Rural Roadway Types, 3 Urban Roadway Types Roadway Type Merges VM-1 Roadway TypesVM-2 Roadway Types Interstate  (1) Interstate Other Arterial  (2) PA - Other Freeways + (3) PA – Other + (4) Minor Arterial Other Urban (rural)  (5) Major Collector + (6) Minor Collector + ( 7) Local 9

10. Example – State Vehicle Summary Data 10

11. Calculate VMT by Vehicle Types & Roadway Types VMT by vehicle types = % by vehicle type x VMT by road types Example: 11 16941Rural Interstate VMT X times the percentages MotorCycle Passenger CarLight TruckBusSingle Unit Combinatio n TruckTotal 0.49%62.82%19.50%0.21%3.90%13.08%100.00% Rural Interstate VMT by Vehicle Types 83.010642.33303.535.6660.72215.916941

12. Example – Percentage of Single Unit Truck showing dramatic changes 12

13. Example – Single Unit Truck VMT

14. 14 State X Box Plot for 6 Vehicle Types

15. Example – dramatic changes 15

16. Example – Unusual High /Low 16

17. Example – 1. decimal issues 2. other urban bus % = 0% 17

18. Example – lower class roads have more Combination Truck 18

19. Example – Lower class roads have more Combination Truck 19

20. Questions? Patrick Zhang patrick.zhang@dot.gov 202-366-1941 20