2 Topics of Discussion National roundabouts data base 3-65 project data base Operations data Safety data Speed data Geometric data Bicycle/pedestrian

Transcription

1 NCHRP 3-65: Applying Roundabouts in the United States Data Collection and Extraction Bhagwant Persaud, Canada David Harkey, USA George Mason University, USA McDonald & Partners, UK Michael Kyte, University of Idaho TRB Roundabout Conference, Vail, CO May 23, 2005 Rensselaer Polytechnic University, USA Rod Troutbeck, Australia Ruhr-University Bochum, Germany University of Idaho, USA National Roundabout Conference 2005 DRAFT National Roundabout Conference 2005 DRAFT National Roundabout Conference 2005 DRAFT

2 2 Topics of Discussion National roundabouts data base 3-65 project data base Operations data Safety data Speed data Geometric data Bicycle/pedestrian data

3 3 Roundabouts in U.S.

4 Urban 4 Roundabout setting Suburban Rural

5 6 5 5 Number of approaches

6 6 Number of lanes on circulatory roadway

7 Previous facility One-way stop control Two-way stop control All-way stop control Signal control None

8 2000 or later 8 Year created or earlier

9 Northeast (0,1) Mid-Atlantic (2) South, Southeast (3,7) Geographic location (zip code) Midwest (4,5,6) Mountain West (8) Pacific Coast (9)

10 10 Video data collection sites WA: 2 Pilot, 9 OR: 2 UT: 1 CA: 2 CO: 4 NV: 4 KS: 1 New England: 4 MI: 1 MD: 7 FL: 1

11 MD: 4 11 Video data collection sites - operations WA: 7 New England: 2 OR: 1 MI: 1 FL: 1

12 12 Mast and camera

13 13 Mast and camera

14 14 Mast and camera

15 15 Field of view

16 16 Field of view

17 17 Example fields of view: MD06 Table 1. MD06. MD 2 at MD 408/MD 422, Lothian, Maryland Lanes on circulatory roadway Lanes on approaches Number of approaches MD06-E1 MD06-N1 MD06-S1

18 18 Total video time, operations data set One lane sites 10 sites 16 unique approaches Video tape time: 15:53:16 Two lane sites 6 sites 10 unique approaches Video tape time: 18:30:18

19 19 Queue presence: WA03-S3

20 Proportion time queued vs. time, WA04-N Proportion time queued :00 1:00 2:00 3:00 4:00 Time 20

21 21 Events of interest: ME01-E z 1 a 2 s

22 22 Events of interest: ME01-E z 1 a 2 s Events recorded: z - upstream point 1 - first in queue point 2 - entry point s - conflict point a - exit point

23 23 Parameters: ME01-E z 1 2 s a Parameters: (1-minute summaries) Entry flow Exit flow Circulating flow Service time Move up time Percent time queued

24 Events of interest: ME01-E z 1 a 2 s Parameters: (1-minute summaries) Delay z 2 [difference between measured and free flow travel times] 24

25 25 Events of interest: UT02 Parameters: Turning movements Travel times

26 26 Events of interest: UT02 Parameters: Accepted gaps Rejected gaps Follow up times

27 Operations data set highlights one lane sites 25 Percent time queued > Entry flow (veh/min) Conflicting flow (veh/min) 27

28 Operations data set highlights one lane sites National Roundabout Conference 2005 DRAFT 28

29 Operations data set highlights one lane sites U-turn RT LT TH Number of observations Travel time (sec)

30 Operations data set highlights one lane sites Gap sequences Accepted lag 8282 Rejected lag followed by accepted gap 1318 Rejected lag, followed by one or more rejected gaps, followed by accepted gap

31 Operations data set highlights two lane sites National Roundabout Conference 2005 DRAFT 31

32 Operations data set highlights two lane sites LL RL Number of observations Average delay (sec/veh) 32

33 Safety data collection sites ME: 1 33 WA: 20 OR: 6 NV: 11 CA: 6 UT: 1 KS: 10 CO: 18 MO: 1 MS: 1 MI: 3 VT: 3 CT: 2 NJ: 1 MD: 26 FL: 4 SC: 1 WI: 1

34 Safety data collection - overview Crash Data Number of sites Intersection Crash Data Collected 117 Approach-Specific Crash Data Collected 55 Approach Data Collected/Extracted Geometric Data Collected Geometric Data Extracted Video Data Collected/Received Operational Data Extracted Speed Data Collected National Roundabout Conference 2005 DRAFT National Roundabout Conference 2005 DRAFT National Roundabout Conference 2005 DRAFT 34

35 Geometric data collection - overview National Roundabout Conference 2005 DRAFT 35

36 36 Geometric data collection - overview Previous Leg Approach Leg of Interest Opposite Leg Next Leg

37 Speed data collection - overview Previous Leg Approach Leg of Interest Speed, mi/hr 10 Opposite Leg 5 0 R1 R2 R3 R4 Segment Next Leg

38 Speed data collection - overview Previous Leg Approach Leg of Interest Speed, mi/hr 10 Opposite Leg 5 0 R1 R2 R3 R4 Segment Next Leg

39 Speed data collection - overview Previous Leg Approach Leg of Interest Speed, mi/hr 10 Opposite Leg 5 0 R1 R2 R3 R4 Segment Next Leg

40 Speed data collection - overview Previous Leg Approach Leg of Interest Speed, mi/hr 10 Opposite Leg 5 0 R1 R2 R3 R4 Segment Next Leg

41 Video data collection: Bicycles/pedestrians WA: 2 41 OR: 1 VT: 1 UT: 1 CA: 2 MD: 1 NV: 1 FL: 1 (1)

42 42 And now for the details