TDOT Traffic Monitoring Program
Introduction Steve Allen Transportation Director Project Planning Division
Travel Data Collection
Tube Count (Coverage Count) There are 12,163 active counts Interstates and State Routes counted every year Functional Class Roads counted every 2 years Have access to 911 archived counts
Ramp Count There are 997 Ramp Counts made every year
Ramp Stations in four Major Counties 19 DAVIDSON 380 33 HAMILTON 155 47 KNOX 200 79 SHELBY 262 TOTAL RAMPS 997
Weigh-in in-motion Count * 96 total WIM stations * Counted on a 3 year rotating basis
Adjustment Factors
Statewide ATR RWIS Sites Tennessee traffic monitoring consists of thirty two (32) Automatic Traffic Recorders (ATR) and nearly twelve-thousand(12,000) coverage count (cycle count) locations on an annual / rotating basis.
AADT Map
AADT Map
Traffic Counter Technology
RWIS Roadway Weather & Traffic Information System
WAVETRONIX WAVE ADT Pass/Pick Su Trk Mu Trk % of Diff. (+ / -) % % % 21205 (2.82) (615) 87.94 5.65 4.24 21770 (0.23) (50) 87.95 6.07 4.15 22030 0.96 210 86.80 5.07 4.74 21977 0.72 157 87.22 5.74 4.52 23312 6.84 1492 88.67 5.43 4.06
ITS SYSTEM NASHVILLE DAVIDSON COUNTY ITS SYSTEM * 156 Total ITS Site in Davidson County * 48 RTMS Sites 24 different Locations * 12 VDS Sites 6 different Locations KNOXVILLE KNOX COUNTY ITS SYSTEM * 213 Total ITS Site in Knox County * 62 RTMS Sites 31 different Locations * 26 VDS Sites 13 different Locations MEMPHIS SHELBY COUNTY ITS SYSTEM * Scheduled for 2008 CHATTANOOGA HAMILTON COUNTY ITS SYSTEM * Scheduled for 2009
All ITS Sites In Davidson County
ITS Locations utilized for Traffic Data Collection
All ITS Sites In Knox County
ITS Locations utilized for Traffic Data Collection
* Remote Traffic Microwave Sensors (RTMS) * The non-intrusive is a low-cost, easy and safe to install * RTMS provides per lane presence, volume, occupancy, speed, and classification information in up to eight user-defined detection zones simultaneously.
ITS Summary RADAR and Video
Proposed Crittenden County, AR and Shelby County, TN ITS System
Traffic Projections for Project Planning Enhanced Coordination Opportunities
Examples of Computer Model Assignments to Derive Project Level Forecasts
Project I The Good
Forecast Line on years 2011 2031 and is calculated based on years 1985 2006. Growth Factor 3.256
Project II The Bad
Segment 1
STEP 1 Using 2002 ADAM Station #145 = 17,390 AADT Using 2002 MPO Model traffic = 10,900 AADT Adjustment factor: 17,390 / 10,900 = 1.6 STEP 2 Using 2006 MPO Model traffic = 11,100 AADT 11,100 * 1.6 (Adjustment factor) = 17,760 2006 AADT
Weekday Daily Average Adjustment Month Year Traffic Traffic Daily Factor Remarks 03 1985 6,432 6,046 5,925 0.98 03 1986 7,645 7,339 7,192 0.98 03 1987 9,188 8,644 0.98 NEW SUBDIVISION 04 1988 9,924 8,657 0.98 03 1989 11,192 10,420 0.98 02 1990 10,620 10,407 0.98 03 1991 10,893 10,348 10,141 0.98 02 1992 11,376 11,262 11,037 0.98 02 1993 9,533 9,438 9,249 0.98 11 1994 15,055 14,001 13,721 0.98 10 1995 14,120 13,414 13,145 0.98 12 1996 15,909 14,954 14,655 0.98 10 1997 15,091 13,733 13,458 0.98 10 1998 16,997 15,637 15,325 0.98 11 1999 20,463 19,031 18,650 0.98 CT. LOOKS GOOD 09 2000 19,653 17,098 16,756 0.98 10 2001 20,475 18,428 18,059 0.98 08 2002 19,717 17,745 17,390 0.98 11 2003 21,571 19,629 19,237 0.98 11 2004 21,288 19,585 19,193 0.98 10 2005 22,136 20,365 19,958 0.98 11 2006 22,482 20,683 20,270 0.98 01 2011 0 0 24,211 0.00 01 2012 0 0 24,889 0.00 01 2013 0 0 25,567 0.00 01 2014 0 0 26,245 0.00 01 2015 0 0 26,923 0.00 01 2016 0 0 27,601 0.00 01 2017 0 0 28,279 0.00 01 2018 0 0 28,957 0.00 01 2019 0 0 29,634 0.00 01 2020 0 0 30,312 0.00 01 2021 0 0 30,990 0.00 01 2022 0 0 31,668 0.00 01 2023 0 0 32,346 0.00 01 2024 0 0 33,024 0.00 01 2025 0 0 33,702 0.00 01 2026 0 0 34,380 0.00 01 2027 0 0 35,058 0.00 01 2028 0 0 35,735 0.00 01 2029 0 0 36,413 0.00 01 2030 0 0 37,091 0.00 01 2031 0 0 37,769 0.00 Forecast Line based on years 2007 2011 and is based on years 1994 2005 Growth factor 3.148 STEP 3 Apply ADAM Station #145 growth rate of : 3.2%/yr to get from Base year of 2006 to requested year 2011 traffic. 3.2% * 5 (years) = 1.16 * 17,760 = 20,600 AADT
STEP 4 Model assigns 0% growth for 20 years. 2006 MPO model traffic = 11,100 2030 MPO model traffic = 11,100 Final Segment Forecasted Traffic 2011 AADT = 20,600 2031 AADT = 20,600
Segment 2
STEP 1 Using 2002 ADAM Station #149 = 9,700 AADT Using 2002 MPO Model traffic = 5,200 AADT Adjustment factor: 9,700 / 5,200 = 1.86 Adjustment factor STEP 2 Using 2006 MPO Model traffic = 4,900 AADT 4,900 * 1.86 (Adjustment factor) = 9,120 2006 AADT
AverageAverage Adjusted Axle Weekday Daily Average Adjustment Month Year Traffic Traffic Daily Factor Remarks 03 1985 2,447 2,300 2,254 0.98 03 1986 2,915 2,798 2,742 0.98 03 1987 3,840 3,613 0.98 04 1988 4,212 3,674 0.98 03 1989 4,495 4,185 0.98 02 1990 4,354 4,266 0.98 03 1991 4,200 3,990 3,910 0.98 02 1992 3,782 3,782 3,706 0.98 02 1993 3,177 3,175 3,082 0.98 11 1994 7,132 6,633 6,500 0.98 09 1995 6,794 6,250 6,125 0.98 12 1996 7,036 7,106 6,964 0.98 10 1997 7,652 6,963 6,824 0.98 10 1998 8,208 7,551 7,400 0.98 11 1999 9,042 8,409 8,241 0.98 09 2000 9,614 8,364 8,197 0.98 10 2001 10,405 9,365 9,178 0.98 09 2002 10,756 9,895 9,697 0.98 11 2003 11,457 10,425 10,217 0.98 12 2004 0 0 10,524 0.98 EST 10 2005 12,221 11,243 11,018 0.98 11 2006 12,659 11,646 11,413 0.98 01 2011 0 0 13,400 0.00 01 2012 0 0 13,843 0.00 01 2013 0 0 14,286 0.00 01 2014 0 0 14,730 0.00 01 2015 0 0 15,173 0.00 01 2016 0 0 15,616 0.00 01 2017 0 0 16,059 0.00 01 2018 0 0 16,502 0.00 01 2019 0 0 16,945 0.00 01 2020 0 0 17,388 0.00 01 2021 0 0 17,831 0.00 01 2022 0 0 18,274 0.00 01 2023 0 0 18,717 0.00 01 2024 0 0 19,160 0.00 01 2025 0 0 19,603 0.00 01 2026 0 0 20,046 0.00 01 2027 0 0 20,489 0.00 01 2028 0 0 20,932 0.00 01 2029 0 0 21,375 0.00 01 2030 0 0 21,818 0.00 01 2031 0 0 22,261 0.00 Forecast Line based on years 2007 2011 and is based on years 1994 2005 Growth factor 4.21 STEP 3 Apply ADAM Station #149 growth rate of : 4.2%/yr to get from Base year of 2006 to requested year 2011 traffic. 4.2% * 5 (years) = 1.21 * 9,120 = 11,040 AADT
STEP 4 Model growth = Future (2030 Model) / Base (2006 Model) 6,300 / 4,900 = 1.285 / 24 (years difference in model) = 1.19%/yr.0119 * 20 (years) = 1.238 * 11,040 = 13,670 AADT Final Segment Forecasted Traffic 2011 AADT = 11,040 2031 AADT = 13,670
Segment 3
Step 1 Using 2002 ADAM Station #149 = 9,700 AADT (Closest count station) 2002 MPO Model traffic = 4,800 AADT * Same adjustment factor used in Segment 2 is also used for Segment 3, based on the only count station (#149) 1.86 Adjustment factor Step 2 Using 2006 MPO Model traffic = 5,900 AADT 5,900 * 1.86 (Adjustment factor) = 10,980 2006 AADT
Step 3 Apply ADAM Station #149 growth rate of : 4.2%/yr to get from Base year of 2006 to requested year 2011 traffic. 4.2% * 5 (years) = 1.21 * 10,980 = 13,290 AADT Step 4 Model growth = Future (2030 Model) / Base (2006 Model) 6,300 / 4,900 = 1.285 / 24 (years difference in model) = 1.19%/yr.0119 * 20 (years) = 1.238 * 13,290 = 16,450 AADT
Final Segment Forecasted Traffic 2011 AADT = 13,290 2031 AADT = 16,450
Project III The Ugly
Turning Movement Sheet
2002 Turning Movement Count most recent data Model illustrates Negative Growth Cycle Count (ADAM) growth 0.7% / year applied to 2002 Turning Movement 0.7 * 10 (years) = 1.07 - applied for 2012 AADT 0.7 * 20 (years) = 1.14 applied for 2032 AADT
Questions