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2011 Freeway Congestion Monitoring Program Findings TPB Technical Committee December 2, 2011 Greg Jordan, SKYCOMP, Inc & Daivamani Sivasailam, DTP TPB.

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Presentation on theme: "2011 Freeway Congestion Monitoring Program Findings TPB Technical Committee December 2, 2011 Greg Jordan, SKYCOMP, Inc & Daivamani Sivasailam, DTP TPB."— Presentation transcript:

1 2011 Freeway Congestion Monitoring Program Findings TPB Technical Committee December 2, 2011 Greg Jordan, SKYCOMP, Inc & Daivamani Sivasailam, DTP TPB Tech Item # 2

2 Purpose  Identify severity and extent of congestion on major highways in the region as an input to the Congestion Management Process  Identify bottlenecks, operational issues  Obtain speed, volume, delay data for model (travel demand/emissions) validation  Review trends and changes over time 2

3 Background (Methodology)  Congestion Monitoring once in three years since 1993  Entire freeway system, parkways and other facilities  4 days of overlapping pictures during 3 hours of AM and PM peak period  Vehicles counted and “Density” (passenger cars, per lane, per mile) of the facility calculated  Volume and speed estimated from Density  Levels of service estimated and reported  Performance compared with previous surveys 3

4 Levels of Service – Speed Chart Severe Congestion – Seen during all survey observations Volatile Congestion Spillback Zone – Severe congestion seen during some observations Marginal or Intermittent Congestion – Not severe congestion 4

5 Analysis  “Top Ten” congested locations (bottlenecks) based on density  “Top Ten” congested corridors based on travel time  Improvement or degradation over time with reasons where possible  Comparisons with INRIX speed data on freeways 5

6 INRIX  A private provider of real-time(24/7) and historical traffic speed and travel time data on major highways since 2008  Analysis provides daily, monthly, seasonal variations, and travel time reliability  Comparison with SKYCOMP data indicates good match on bottleneck locations (6 out of top 10) and congested corridors  Further integration of INRIX and SKYCOMP data in congestion monitoring will be studied for the future 6

7 2011 AM Peak Period Performance 7

8 2011 PM Peak Period Performance 8

9 2011 Top Ten Bottlenecks 9

10 RankRouteFromTo Density (pcplpm)Speed Range 1*NB I-395 (8:30 to 9:30 AM)VA 27 (Washington Blvd)VA 110 (Jefferson Davis Hwy)1455 MPH 2A*IL I-495 (5:30 to 6:30 PM)VA 193 (Georgetown Pike)George Washington Mem Pkwy1255 to 10 MPH 2BSB I-395/SW Fwy (6:00 to 7:00 PM)4th St12th St1255 to 10 MPH 4*EB I-66 (6:00 to 7:00 PM)VA 7 (Leesburg Pike)Dulles Access1157 to 12 MPH 5A*IL I-495 (4:30 to 5:30 PM)MD 355 / I-270MD 185 (Connecticut Ave)11010 to 15 MPH 5BOL I-495 (5:30 to 6:30 PM)VA 267 (Dulles Toll Rd)VA 123 (Chain Bridge Rd)11010 to 15 MPH 7A*OL I-495 (8:00 to 9:00 AM)I-95MD 650 (New Hampshire Ave)10512 to 20 MPH 7B*IL I-495 (8:00 to 9:00 AM)Gallows RdUS 50 (Arlington Blvd)10512 to 20 MPH 8AEB I-66 (7:00 to 8:00 AM)VA 234 BypassVA 234 (Sudley Rd)9515 to 25 MPH 8BWB 11th St Bridge (7:30 to 8:30 AM)I-295Southeast Fwy9515 to 25 MPH * These bottleneck locations were flagged in the INRIX analysis 2011 Top Ten Bottlenecks 10

11 2011 AM Longest Delay Corridors 11

12 2011 PM Longest Delay Corridors 12

13 NoRoadTimeDirectionFromTo Queue Length (miles) Estimated Travel Time (minutes) Estimated Speed (mph) Estimated Delay (minutes) 1I-95/I-3957:30 – 8:30NorthboundUS 1GWMP18.362.81844.4 2I-667:00 – 8:00EastboundVA 234 BypassI-49519.448.02428.6 3I-4957:00 – 8:00OuterloopUS 1I-27010.028.72118.7 4I-4958:00 – 9:00InnerloopI-95I-668.024.91916.9 5GWMP7:30 – 8:30Eastbound Chain Bridge Rd I-665.316.51911.2 NoRoadTimeDirectionFromTo Queue Length (miles) Estimated Travel Time (minutes) Estimated Speed (mph) Estimated Delay (minutes) 1I-4955:30 – 6:30InnerloopVA 7I-270 Spur10.341.81531.5 2I-3955:00 – 6:00NorthboundVA 110 Pennsylvania Ave 4.319.21314.9 3I-4954:30 – 5:30OuterloopMD 187VA 2368.822.62313.8 4I-954:30 – 5:30SouthboundI-495VA 1239.722.42612.8 5I-664:30 – 5:30WestboundI-495VA 23416.828.33611.5 AM Peak PM Peak 13

14 2011 Significant Changes AM Peak Period 14

15 2011 Significant Changes PM Peak Period 15

16 Changes to I-95 as a result of Wilson Bridge Improvements 16

17 Changes to I-66 17

18 18

19 Summary of Findings  Lane miles of congestion have increased significantly between 2008 and 2011, after decreasing between 2005 and 2008  More peak spreading is occuring  Construction activity results in higher densities and lower speeds  Projects under construction(I-95 and I-495 HOT Lanes, spot improvements on I-66) should reduce delay and congestion 19

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