Performance Measure Summary - Boston MA-NH-RI. Performance Measures and Definition of Terms

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1 Performance Measure Summary - Boston MA-NH-RI There are several inventory and performance measures listed in the pages of this Urban Area Report for the years from 1982 to There is no single performance measure that experts agree says it all. A few key points should be recognized by users of the Urban Mobility Scorecard data. Use the trends The multi-year performance measures are better indicators, in most cases, than any single year. Examining a few measures over many years reduces the chance that data variations or the estimating procedures may have caused a "spike" in any single year. (5 years is 5 times better than 1 year.) Use several measures Each performance measure illustrates a different element of congestion. (The view is more interesting from atop several measures.) Compare to similar regions Congestion analyses that compare areas with similar characteristics (for example, population, growth rate, road and public transportation system design) are usually more insightful than comparisons of different regions. (Los Angeles is not Peoria.) Compare ranking changes and performance measure values In some performance measures a small change in the value may cause a significant change in rank from one year to the next. This is the case when there are several regions with nearly the same value. (15 hours is only 1 hour more than 14 hours.) Consider the scope of improvement options Any improvement project in a corridor within most of the regions will only have a modest effect on the regional congestion level. (To have an effect on areawide congestion, there must be significant change in the system or service.) Performance Measures and Definition of Terms Travel Time Index A measure of congestion that focuses on each trip and each mile of travel. It is calculated as the ratio of travel time in the peak period to travel time in free-flow. A value of 1.30 indicates that a 20-minute free-flow trip takes 26 minutes in the peak. Planning Time Index A travel time reliability measure that represents the total travel time that should be planned for a trip. Computed with the 95th percentile travel time it represents the amount of time that should be planned for a commute trip to be late for only 1 day a month. If it is computed with the 80th percentile travel time it represents the amount of time that should be planned for a trip to be late for only 1 day a week. A PTI of 2.00 means that for a 20-minute trip in light traffic, 40 minutes should be planned. Peak Commuters Number of travelers who begin a trip during the morning or evening peak travel periods (6 to 10 a.m. and 3 to 7 p.m.). "Commuters" are private vehicle users unless specifically noted. per Commuter A yearly sum of all the per-trip delays for those persons who travel in the peak period (6 to 10 a.m. and 3 to 7 p.m.). This measure illustrates the effect of traffic slowdowns as well as the length of each trip. Total Delay The overall size of the congestion problem. Measured by the total travel time above that needed to complete a trip at free-flow speeds. The ranking of total delay usually follows the population ranking (larger regions usually have more delay). Free-Flow Speeds These values are derived from overnight speeds in the INRIX speed database. They are used as the national comparison thresholds. Other speed thresholds may be appropriate for urban project evaluations or sub-region studies. Excess Fuel Consumed Increased fuel consumption due to travel in congested conditions rather than freeflow conditions. Congestion Cost Value of travel delay for 2014 (estimated at $17.67 per hour of person travel and $94.04 per hour of truck time) and excess fuel consumption estimated using state average cost per gallon. Urban Area The developed area (population density more than 1,000 persons per square mile) within a metropolitan region. The urban area boundaries change frequently (every year for most growing areas), so increases include both new growth and development that was previously in areas designated as rural. Number of Rush Hours Time when the road system might have congestion.

2 Inventory Measures Population (1000s) 4,440 4,395 4,355 4,320 4,295 Rank Commuters (1000s) 1,704 1,697 1,695 1,678 1,661 Freeway 41,097 41,470 40,905 42,357 42,102 Arterial Streets 36,127 36,019 35,240 34,942 34,732 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Congested Travel (% of peak VMT) Congested System (% of lane-miles) Congested Time (number of "Rush Hours") Total Fuel (1000 gallons) 71,602 70,862 70,078 68,658 67,307 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 153, , , , ,756 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Freeway Planning Time Index (95th Pctile) Rank Total Cost ($ millions) 3,363 3,382 3,394 3,394 3,432 Rank Cost per Peak Auto Commuter ($) 1,388 1,396 1,401 1,401 1,417 Rank

3 Inventory Measures Population (1000s) 4,250 4,190 4,150 4,100 4,050 Rank Commuters (1000s) 1,641 1,611 1,593 1,570 1,542 Freeway 40,700 39,925 40,000 40,300 40,675 Arterial Streets 34,955 35,060 35,515 35,580 35,540 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 64,003 65,070 67,341 66,440 65,444 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 137, , , , ,750 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 3,318 3,360 3,612 3,661 3,726 Rank Cost per Peak Auto Commuter ($) 1,370 1,387 1,491 1,511 1,538

4 Inventory Measures Population (1000s) 4,000 3,960 3,930 3,920 3,900 Rank Commuters (1000s) 1,517 1,499 1,484 1,478 1,464 Freeway 38,585 37,300 36,000 35,200 34,100 Arterial Streets 34,600 34,000 32,865 32,500 32,000 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 64,172 63,258 62,230 60,908 58,954 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 138, , , , ,792 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 3,777 3,822 3,846 3,824 3,807 Rank Cost per Peak Auto Commuter ($) 1,559 1,578 1,588 1,578 1,571

5 Inventory Measures Population (1000s) 3,875 3,880 3,760 3,700 3,680 Rank Commuters (1000s) 1,452 1,448 1,397 1,372 1,359 Freeway 33,000 32,000 30,600 29,875 29,860 Arterial Streets 31,600 30,500 29,500 28,300 27,000 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 56,049 55,304 51,232 46,987 43,872 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 120, , , ,056 94,355 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 3,741 3,772 3,549 3,330 3,201 Rank Cost per Peak Auto Commuter ($) 1,544 1,557 1,465 1,374 1,321

6 Inventory Measures Population (1000s) 3,655 3,640 3,630 3,620 3,610 Commuters (1000s) 1,344 1,336 1,327 1,320 1,311 Freeway 29,495 29,500 29,865 29,340 29,300 Arterial Streets 25,600 24,500 24,000 23,600 23,000 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 42,506 40,580 39,324 38,902 38,647 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 91,417 87,275 84,574 83,666 83,117 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 3,189 3,122 3,116 3,176 3,288 Rank Cost per Peak Auto Commuter ($) 1,316 1,289 1,286 1,311 1,357 Rank

7 Inventory Measures Population (1000s) 3,600 3,560 3,530 3,510 3,500 Commuters (1000s) 1,296 1,269 1,247 1,229 1,215 Freeway 29,685 28,000 26,845 25,000 23,980 Arterial Streets 22,500 21,750 21,220 20,905 20,960 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 37,043 35,069 33,191 31,353 29,500 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 79,669 75,423 71,383 67,430 63,446 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 3,322 3,296 3,248 3,181 3,048 Rank Cost per Peak Auto Commuter ($) 1,371 1,361 1,341 1,313 1,258 Rank

8 Inventory Measures Population (1000s) 3,485 3,475 3,450 Rank Commuters (1000s) 1,199 1,185 1,166 Freeway 22,750 21,775 20,670 Arterial Streets 20,640 20,485 20,240 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Congested Travel (% of peak VMT) Congested System (% of lane-miles) Congested Time (number of "Rush Hours") Total Fuel (1000 gallons) 27,300 25,159 24,453 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 58,714 54,110 52,591 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Freeway Planning Time Index (95th Pctile) Rank Total Cost ($ millions) 2,921 2,809 2,817 Rank Cost per Peak Auto Commuter ($) 1,206 1,159 1,163 Rank 8 6 7