Performance Measure Summary - St. Louis MO-IL. Performance Measures and Definition of Terms

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1 Performance Measure Summary - St. Louis MO-IL 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) 2,200 2,200 2,200 2,195 2,195 Rank Commuters (1000s) 1,120 1,142 1,142 1,137 1,133 Freeway 31,260 30,557 29,490 30,207 30,181 Arterial Streets 19,537 19,248 19,185 19,743 19,726 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) 32,991 32,801 32,565 32,329 32,302 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 69,350 68,951 68,455 67,959 67,901 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) 1,637 1,654 1,666 1,688 1,740 Rank Cost per Peak Auto Commuter ($) 1,020 1,031 1,039 1,052 1,085 Rank

3 Inventory Measures Population (1000s) 2,190 2,185 2,175 2,160 2,150 Rank Commuters (1000s) 1,127 1,120 1,107 1,092 1,079 Freeway 29,700 29,455 29,610 27,860 27,200 Arterial Streets 18,900 18,000 18,145 17,100 17,500 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 31,824 33,753 32,926 32,179 31,344 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 66,896 70,952 69,214 67,642 65,887 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 1,743 1,841 1,866 1,873 1,885 Rank Cost per Peak Auto Commuter ($) 1,086 1,148 1,163 1,168 1,175 Rank

4 Inventory Measures Population (1000s) 2,130 2,115 2,100 2,075 2,040 Rank Commuters (1000s) 1,063 1,050 1, Freeway 27,665 27,200 26,900 26,400 25,900 Arterial Streets 17,390 17,565 17,560 17,540 17,425 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 30,367 29,369 28,480 27,519 26,354 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 63,835 61,737 59,868 57,848 55,398 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 1,888 1,875 1,859 1,825 1,798 Rank Cost per Peak Auto Commuter ($) 1,177 1,169 1,159 1,138 1,121 Rank

5 Inventory Measures Population (1000s) 2,005 2,000 2,000 1,995 1,995 Rank Commuters (1000s) Freeway 25,600 24,960 24,195 23,765 23,310 Arterial Streets 17,380 17,315 17,775 17,635 17,645 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 25,265 24,126 23,034 21,922 20,961 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 53,110 50,716 48,419 46,082 44,061 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 1,781 1,739 1,686 1,641 1,616 Rank Cost per Peak Auto Commuter ($) 1,110 1,084 1,051 1,023 1,007 Rank

6 Inventory Measures Population (1000s) 1,990 1,980 1,970 1,965 1,960 Rank Commuters (1000s) Freeway 22,460 20,730 18,700 17,500 17,670 Arterial Streets 15,100 14,000 13,250 12,415 12,000 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 19,843 17,865 16,492 14,700 13,955 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 41,712 37,554 34,667 30,900 29,336 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 1,573 1,452 1,381 1,268 1,254 Rank Cost per Peak Auto Commuter ($) Rank

7 Inventory Measures Population (1000s) 1,955 1,950 1,940 1,930 1,910 Rank Commuters (1000s) Freeway 17,085 16,835 15,860 16,255 15,590 Arterial Streets 11,750 11,480 11,170 10,900 10,400 Value of Time ($/hour) Commercial Cost ($/hour) Gasoline ($/gallon) Diesel ($/gallon) System Performance Total Fuel (1000 gallons) 12,845 11,809 11,490 11,201 10,284 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 27,002 24,825 24,153 23,545 21,618 Rank Delay per Peak Auto Commuter (pers-hrs) Rank Travel Time Index Rank Commuter Stress Index Rank Total Cost ($ millions) 1,217 1,173 1,188 1,200 1,123 Rank Cost per Peak Auto Commuter ($) Rank

8 Inventory Measures Population (1000s) 1,890 1,875 1,870 Rank Commuters (1000s) Freeway 14,620 14,000 13,365 Arterial Streets 10,000 9,850 9,700 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) 9,855 9,064 8,564 Rank Fuel per Peak Auto Commuter (gallons) Rank Total Delay (1000s of person-hours) 20,716 19,054 18,002 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) 1,114 1,069 1,042 Rank Cost per Peak Auto Commuter ($) Rank