USE OF BLUETOOTH TECHNOLOGY IN TRAFFIC DATA COLLECTION & MANAGEMENT
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1 USE OF BLUETOOTH TECHNOLOGY IN TRAFFIC DATA COLLECTION & MANAGEMENT Justin Effinger, EIT Research Assistant/Teaching Assistant Department of Civil Engineering & Mechanics University of Wisconsin Milwaukee
2 What is Bluetooth Technology? Time = 9:36:03 AM Bluetooth Detectors 3 Miles Time = 9:40:05 AM Travel Time = 242 seconds Speed = MPH
3 Research Background Bluetooth Detectors Provided by TrafficCast (Leased by WisDOT) Data sets were downloaded on TrafficCast s website Research Funding Smart Work Zone Deployment Initiative Wisconsin Department of Transportation
4 Why is Bluetooth Technology the Future? Technological Resources Available to Drivers 85 % of Drivers Computer Cell phone Smart cell phone (iphone, blackberry, droid, etc.) GPS Car features (OnStar, SYNC, GPS, etc.) Survey Date: April 14, 2011 June 3, 2011
5 Current Presentation Discuss how we placed Bluetooth detectors for diversion analysis Discuss how many vehicles are really being detected Taking out all of the drivers that stopped along the way Discuss if implementation of Bluetooth devices in urban areas is better than rural
6 Case Study Locations Tomah Work Zone Portage Work Zone
7 Background of the Work Zones Portage Work Zone Rural freeway (I-39/I-90/I-94) Gateway from Madison/Milwaukee/Chicago to Minneapolis or Wausau Multiple alternate routes including a regional route Freeway crossover (3 lanes to 2 in each direction)
8 Background of the Work Zones
9 Background of the Work Zones Tomah Work Zone Rural freeway (I-90/I-94) Gateway from Madison/Milwaukee/Chicago to Minneapolis Two construction zones Only one obvious alternate route Freeway crossover (2 lanes to 1 in each direction)
10 Background of the Work Zones
11 Concepts Pair 2 Bluetooth Stations
12 Concepts Triple 3 Bluetooth Stations
13 Concepts Number of Usable Pairs Total number of pairs that pass reasonable travel time filters (filtering out people that stopped and got back on) True Capture Rate Ratio of the number of usable pairs to the total through volume (subtracting the exiting volume)
14 Bluetooth Triples & Quadruples Created a program to filter out unreasonable travel times Created a false positive rate (varied 0% - 10%)
15 True Capture Rate Modeling Linear programing in Excel was used to create a flow balance Using volumes in the field and historical volumes
16 Results Portage Work Zone 2 days of noticeable congestion Sunday, September 19, 2010 had the most congestion (SB direction) Time intervals: 11:00 AM 8:00 PM Non-closure comparison: Sunday, March 20, 2011 Tomah Work Zone 3 days of noticeable congestion Sunday, April 10, 2011 was chosen for this presentation (WB direction) Time Intervals: 2:30 PM 9:00 PM Non-closure comparison: Sunday, November 12, 2010
17 Results Travel Time (averaged) Portage Work Zone (BT11 BT1) Through work zone: 5203 sec. (1 hr. 26 min. 43 sec.) US 51: 4401 sec. (1 hr. 13 min. 21 sec.) US 12: 4085 sec. (1 hr. 8 min. 5 sec.) Tomah Work Zone (BT108 BT104) Through work zone: 3037 sec. (50 min. 37 sec.) US 12: 2271 sec. (37 min. 51 sec.)
18 Results Driver Survey (464 Drivers Surveyed) 35 Amount of perceived travel time savings on the alternate route to divert Less than 5 min 5 10 min min min min Greater than 25 min Won't Change their route
19 Results The number of usable pairs on the freeway increases during the work zone, but the increase is small (Speed might have an impact). Bluetooth Pair Date (Closure or Non Distance (miles) Number of usable pairs BT11 BT BT11 BT5 9/19/2011 ( BT5 BT BT5 BT3 9/19/2011 ( BT13 BT BT13 BT5 9/19/2011 ( BT13 BT BT13 BT3 9/19/2011 (
20 Results BT11 Non-Closure: 19,357 Closure: 27,658 Theory: There are more Bluetooth enabled devices on the road during non-work zone conditions. Bluetooth Pair Date (Closure or Non Distance (miles) Number of usable pairs BT11 BT BT11 BT5 9/19/2011 ( BT5 Non-Closure: 29,006 Closure: 38,046 BT5 BT BT5 BT3 9/19/2011 ( BT13 BT BT3 Non-Closure: 27,563 Closure: 40,049 BT13 BT5 9/19/2011 ( BT13 BT BT13 BT3 9/19/2011 (
21 Results The number of usable pairs on the arterial streets is significantly larger during work zone conditions. Bluetooth Pair Date (Closure or Non Distance (miles) Number of usable pairs Percentage occurring during congestion BT11 BT BT11 BT6 9/19/2011 ( BT10 BT BT10 BT6 9/19/2011 ( BT6 BT BT6 BT3 9/19/2011 ( BT11 BT BT11 BT9 9/19/2011 ( BT10 BT BT10 BT9 9/19/2011 ( BT9 BT BT9 BT1 9/19/2011 (
22 Results The true capture rate increases as the distance increases The true capture rate is higher during the non-closure weekend Factors are speculation Bluetooth Pair Date (Closure or Non Distance (miles) True Capture Rate BT13 BT BT13 BT5 9/19/2011 ( BT13 BT BT13 BT3 9/19/2011 (
23 Results Bluetooth Pair Date (Closure or Non Distance (miles) True Capture Rate BT108 BT107 11/12/2010 (Non BT108 BT107 4/10/2011 ( BT108 BT104 11/12/2010 (Non BT108 BT104 4/10/2011 ( The true capture rate increases as the distance increases The true capture rate is higher during the non-closure weekend Factors are speculation
24 Preliminary Results Using Bluetooth Technology for diversion WB (NB) Triple Closure Non Closure BT1 BT9 BT BT1 BT6 BT BT2 BT6 BT BT3 BT6 BT BT4 BT6 BT EB (SB) Triple Closure Non Closure BT11 BT9 BT1 5 0 BT11 BT6 BT BT10 BT6 BT1 2 0 BT7 BT6 BT1 5 0 BT8 BT6 BT1 3 1
25 Preliminary Results Using Bluetooth Technology for diversion WB Triple Closure Non Closure BT108 BT102 BT BT108 BT112 BT BT108 BT106 BT BT104 BT102 BT BT108 BT105 BT EB Triple Closure Non Closure BT101 BT105 BT BT101 BT102 BT BT103 BT106 BT BT103 BT112 BT
26 Is Urban better than Rural? Milwaukee Work Zone 2 construction zones (I-94 E/W Corridor) Waukesha County (EB & WB) Milwaukee County (WB only) One of the busiest stretches of freeway in Wisconsin This presentation concentrates on the Waukesha County work zone.
27 Is Urban better than Rural?
28 Is Urban better than Rural? Bluetooth Pair Date (Closure or Non Distance (miles) Number of usable pairs Bluetooth Pair Date (Closure or Non Distance (miles) Number of usable pairs BT11 BT MBT10 MBT4 2/24/2011 (Non BT11 BT5 9/19/2011 ( MBT10 MBT4 5/19/2011 ( BT5 BT MBT4 MBT1 2/24/2011 (Non BT5 BT3 9/19/2011 ( MBT4 MBT1 5/19/2011 ( BT11 BT MBT10 MBT6 2/24/2011 (Non BT11 BT6 9/19/2011 ( MBT10 MBT6 5/19/2011 (
29 Is Urban better than Rural? Bluetooth Pair Date (Closure or Non Number of usable pairs % of pairs being filtered out Bluetooth Pair Date (Closure or Non Number of usable pairs % of pairs being filtered out BT11 BT MBT10 MBT4 2/24/2011 (Non BT11 BT5 9/19/2011 ( MBT10 MBT4 5/19/2011 ( BT5 BT MBT4 MBT1 2/24/2011 (Non BT5 BT3 9/19/2011 ( MBT4 MBT1 5/19/2011 ( BT11 BT6 0 MBT10 MBT6 2/24/2011 (Non BT11 BT6 9/19/2011 ( MBT10 MBT6 5/19/2011 (
30 Conclusions This research is applying Bluetooth technology in diversion analysis. Documenting the route of a vehicle off the freeway for long distance trips Tomah produced the most conclusive evidence of diversion using the Bluetooth devices. Urban is not necessarily considered better than rural for use of Bluetooth technology. Recommend more research in this area Bluetooth technology is still an on going technology.
31 Acknowledgements UW-Milwaukee Professor Alan Horowitz Assistant Professor Yue Liu UW-Madison Madhav Chitturi Richard Lord Wisconsin Department of Transportation John Shaw
32 Questions?
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