TDOT Traffic Monitoring Program

Transcription

1 TDOT Traffic Monitoring Program

2 Introduction Steve Allen Transportation Director Project Planning Division

3 Travel Data Collection

4 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

5 Ramp Count There are 997 Ramp Counts made every year

6 Ramp Stations in four Major Counties 19 DAVIDSON HAMILTON KNOX SHELBY 262 TOTAL RAMPS 997

7 Weigh-in in-motion Count * 96 total WIM stations * Counted on a 3 year rotating basis

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11 Adjustment Factors

12 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.

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14 AADT Map

15 AADT Map

16 Traffic Counter Technology

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20 RWIS Roadway Weather & Traffic Information System

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29 WAVETRONIX WAVE ADT Pass/Pick Su Trk Mu Trk % of Diff. (+ / -) % % % (2.82) (615) (0.23) (50)

30 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

31 All ITS Sites In Davidson County

32 ITS Locations utilized for Traffic Data Collection

33 All ITS Sites In Knox County

34 ITS Locations utilized for Traffic Data Collection

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36 * 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.

37 ITS Summary RADAR and Video

38 Proposed Crittenden County, AR and Shelby County, TN ITS System

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41 Traffic Projections for Project Planning Enhanced Coordination Opportunities

42 Examples of Computer Model Assignments to Derive Project Level Forecasts

43 Project I The Good

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46 Forecast Line on years and is calculated based on years Growth Factor 3.256

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48 Project II The Bad

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50 Segment 1

51 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, AADT

52 Weekday Daily Average Adjustment Month Year Traffic Traffic Daily Factor Remarks ,432 6,046 5, ,645 7,339 7, ,188 8, NEW SUBDIVISION ,924 8, ,192 10, ,620 10, ,893 10,348 10, ,376 11,262 11, ,533 9,438 9, ,055 14,001 13, ,120 13,414 13, ,909 14,954 14, ,091 13,733 13, ,997 15,637 15, ,463 19,031 18, CT. LOOKS GOOD ,653 17,098 16, ,475 18,428 18, ,717 17,745 17, ,571 19,629 19, ,288 19,585 19, ,136 20,365 19, ,482 20,683 20, , , , , , , , , , , , , , , , , , , , , , Forecast Line based on years and is based on years Growth factor 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

53 STEP 4 Model assigns 0% growth for 20 years MPO model traffic = 11, MPO model traffic = 11,100 Final Segment Forecasted Traffic 2011 AADT = 20, AADT = 20,600

54 Segment 2

55 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, AADT

56 AverageAverage Adjusted Axle Weekday Daily Average Adjustment Month Year Traffic Traffic Daily Factor Remarks ,447 2,300 2, ,915 2,798 2, ,840 3, ,212 3, ,495 4, ,354 4, ,200 3,990 3, ,782 3,782 3, ,177 3,175 3, ,132 6,633 6, ,794 6,250 6, ,036 7,106 6, ,652 6,963 6, ,208 7,551 7, ,042 8,409 8, ,614 8,364 8, ,405 9,365 9, ,756 9,895 9, ,457 10,425 10, , EST ,221 11,243 11, ,659 11,646 11, , , , , , , , , , , , , , , , , , , , , , Forecast Line based on years and is based on years 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

57 STEP 4 Model growth = Future (2030 Model) / Base (2006 Model) 6,300 / 4,900 = / 24 (years difference in model) = 1.19%/yr.0119 * 20 (years) = * 11,040 = 13,670 AADT Final Segment Forecasted Traffic 2011 AADT = 11, AADT = 13,670

58 Segment 3

59 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, AADT

60 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 = / 24 (years difference in model) = 1.19%/yr.0119 * 20 (years) = * 13,290 = 16,450 AADT

61 Final Segment Forecasted Traffic 2011 AADT = 13, AADT = 16,450

62 Project III The Ugly

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64 Turning Movement Sheet

65 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) = applied for 2012 AADT 0.7 * 20 (years) = 1.14 applied for 2032 AADT

66 Questions