ITE Mid-Colonial District Annual Meeting April 29, 2010 Using Bluetooth to Determine Using Bluetooth to Determine Travel Times www.kmjinc.com 1
Agenda • Bluetooth and How It Works • The BlueTOAD TM Device • Evaluation Project Evaluation Project • Overview • Analysis • Results www.kmjinc.com 2
What is Bluetooth? An open wireless communication platform An open, wireless communication platform www.kmjinc.com 3
How does Bluetooth work? • Transmission and acceptance of a “MAC” Transmission and acceptance of a MAC address. • A small transceiver constantly transmits its y own unique MAC address to find other devices with which to communicate. www.kmjinc.com 4
BlueTOAD TM • BlueTOAD TM Device by TrafficCast Device by TrafficCast BlueTOAD ( T ravel-time O rigination A nd D estination) –Collects MAC addresses from Collects MAC addresses from Bluetooth devices anonymously –Mounted 6 to 10 feet above the M t d 6 t 10 f t b th travel lane –Radius of detection is about 175 R di f d t ti i b t 175 feet www.kmjinc.com 5
Travel Time via BlueTOAD TM • Position two or more devices along a roadway network along a roadway network. – MAC addresses are time stamped and matched and matched – Space mean speed is then calculated calculated – Algorithms eliminate outliers – illogical pairs multiple simultaneous illogical pairs, multiple simultaneous addresses, etc. www.kmjinc.com 6
Travel Time via BlueTOAD TM • Position two or more devices along a roadway network network. – Travel time can be captured “station-to-station”, or “end-to-end” in each direction end to end in each direction. 175 ft. www.kmjinc.com 7
Bluetooth - I-76 Evaluation • Purpose – to evaluate a Bluetooth Purpose to evaluate a Bluetooth detecting device to collect and report travel time time. • Study Roadway: I-76 – Major commuter route – EZPass detectors – EZPass detectors – Likely high prevalence of Bluetooth www.kmjinc.com 8
I-76 Eastbound Segment • 2.9 Miles 2.9 Miles • Montgomery Drive to M t D i t Spring Garden Street www.kmjinc.com 9
I-76 Westbound Segment • Waverly Road to I-476 • 2.9 Miles www.kmjinc.com 10
Groundtruth Data Groundtruth Data • RTMS traffic volume counts through PennDOT’s Dynac system • EZPass travel time results reported every • EZPass travel time results reported every 15 minutes • Number of EZPass pairs found through PennDOT’s Transmit server www.kmjinc.com 11
Bluetooth Data Bluetooth Data • TrafficCast provided 15-minute reports for: TrafficCast provided 15 minute reports for: – Average travel time – Average space mean speed (based on average travel time) – Total number of matched pairs www.kmjinc.com 12
Performance Metrics Performance Metrics 1. Travel time 2 Match Rate 2. Match Rate – Percent of matched pairs Percent of matched pairs within the corresponding traffic stream 3. General cost and constructability www.kmjinc.com 13
Travel Times - Eastbound Montgomery Drive to Spring Garden Street www.kmjinc.com 14
Travel Times - Westbound Waverly Road to I-476 Interchange y g www.kmjinc.com 15
Match Rate Comparison Match Rate Comparison Eastbound Device Device Match Rate Match Rate Daily AM Peak Period PM Peak Period BlueTOAD TM 3.5 3.5 4.6 EZPass 29.5 37.1 34.7 Westbound Device Match Rate Daily AM Peak Period PM Peak Period BlueTOAD TM 4.1 4.0 4.0 EZPass 12.9 15.6 16.1 www.kmjinc.com 16
Minimum Match Requirements Minimum Match Requirements • Per 15 minutes: 9 matches • Per hour: P h 36 36 matches t h • Per day: • Per day: 864 matches 864 matches Source: Stanley Young www.kmjinc.com 17
Match Results Westbound Westbound Eastbound Eastbound BlueTOAD TM BlueTOAD TM Minimum Minimum Time Period Time Period Time Period Time Period Match Match Match Match AM Peak AM Peak AM Peak AM Peak PM Peak PM Peak PM Peak PM Peak Requirement Requirement Period Period Period Period 15 minutes 15 minutes 9 9 23 16 19 18 1 hour 1 hour 36 36 145 94 189 94 24 hours 24 hours 864 864 3,288 2,171 www.kmjinc.com 18
Travel Time Results - Eastbound Montgomery Drive to Spring Garden Street EZPass : 1,559 pairs p per hour BlueTOAD TM : 189 pairs per hour EZPass : 1,852 pairs per hour BlueTOAD TM : TM 145 pairs per hour EZPass captured 27,903 pairs BlueTOAD TM captured 3,288 pairs www.kmjinc.com 19
Cost and Constructability Cost and Constructability BlueTOAD TM EZPass BlueTOAD TM base unit BlueTOAD TM base unit, Tag Reader lane kit Tag Reader, lane kit solar battery, cellular $9,700 to and cabinet, mast arm $34,000 to modem, vertical strain pole $12,200 and pole structure $36,000 EZPass EZPass BlueTOAD TM www.kmjinc.com 20
Conclusions Conclusions The Bluetooth detecting devices were found to have the following benefits: • Similar travel time results Similar travel time results • Match rate is adequate • Cost less • Installation is uncomplicated Installation is uncomplicated www.kmjinc.com 21
Thank you for your time Thank you for your time. Any Questions? Any Questions? www.kmjinc.com
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