countywide bluetooth system: use cases & performance measures
TRANSCRIPT
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Bluetooth Travel Time & O/D System
Shaun Quayle, P.E. Washington Co. Traffic Eng.
TREC – Friday Transportation SeminarNovember 3, 2017
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Agenda
• Bluetooth Background• County System • Use Cases
– Operations– Planning
• Perf Meas.
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Need “Statement”
• Realistic existing condition models “Pass the straight face test”
• Discern problem locations, days & times operationally
• Proactive knowledge of issues• Alert of significant travel time change• Track travel time “rankings” over time
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Bluetooth BackgroundBluetooth
TM= robust, short-range wireless radio comm.
protocol between electronic devices
• Unlicensed, low-power 2.4 GHz band
• Media Access Control (MAC) Address• Anonymous Unique Identifier
(48 bit, >28 trillion)
• Class 1 ~300’, Class 2 ~30’, Class 3 ~3’
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Bluetooth Background
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Sampling Relative to Devices
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Washington Co. System
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Use Case #1 – Snow Day! How does snow impact AM peak commute (7am to 9am)?
Rainy Tues. Jan 10th vs. Snowy Wed., Jan 11th
• Cornelius Pass Road • 185th Avenue • Murray Blvd• Durham Road• 72nd Avenue
Beth Nakamura - http://www.oregonlive.com/weather/index.ssf/2017/01/january_snowfall_record-settin.html
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Snow Day = Less Trips
Trips Reduced by 75% (range = 25% to 88%) (Jan 11th snow vs. Jan 10th rain)
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Snow Day = Faster & Slower Travel Times
Average No Change(range = -40% to +48%) (Jan 11th snow vs. Jan 10th
rain)
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Snow Day = Faster & Slower Running Speeds
Average -5% speed reduction(range = -32% to +68%) (Jan 11th snow vs. Jan 10th
rain)
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Use Case #2 –Signal TimingCitizen complaint(s) along Scholls Ferry Road in AM peak.
Impact of signal timing adjustment, setting Nimbus/Scholls “free”Scholls Ferry Road Corridor – Bluetooth readers between 121st and Nimbus during critical AM peak.
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INSERT RESULTS FROM EMAIL
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BEF
OR
EA
FTER
Weekday 6am to 9am
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BEF
OR
EA
FTER
Weekday 7:15am to
8:15am
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Use Case #3 –Model CalibrationNeed to validate existing routing.
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OD Bluetooth v. Regional Model
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Bluetooth Performance Measures
• Travel Time & Planning Time Index• Compare 1 corridor over time• PTI = 95% TT / Free Flow TT (Reliability)
• % Longer than Free Flow• Normalized, multiple corridors over time
• Avg. Running Speed• Normalized, but not relatable to lay audiences
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TV Hwy
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Source: https://www.bostoninteractive.com/blog/marketing/why-we-cant-resist-top-10-posts
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TIGER Congested Locations (Pk Hr)
Rank (1 = most
congested)
Absolute Percent Over "Free Flow"
(5-6am)1 WB TV Hwy - Lombard to Murray 17:00 to 18:00 179%2 WB Scholls Ferry - OR 217 to Murray 17:00 to 18:00 149%3 EB Scholls Ferry - Murray to OR 217 7:00 to 8:00 147%4 WB TV Hwy - Lombard to Murray 16:00 to 17:00 132%5 WB Scholls Ferry - OR 217 to Murray 16:00 to 17:00 120%6 EB Cornell - 25th to Cornelius Pass 17:00 to 18:00 113%7 EB TV Hwy - Murray to Lombard 17:00 to 18:00 112%8 NB Murray - TV to US 26 17:00 to 18:00 110%9 EB TV Hwy - Brookwood to Murray 7:00 to 8:00 109%10 NB Murray - Scholls to TV 7:00 to 8:00 107%
Fall 2016 - Oct 17 to Nov 17, 2016
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TIGER Congested Locations (Pk Hr)
Rank (1 = most
congested)
Absolute Percent Over "Free Flow"
(5-6am)Congestion change
from previous season Top 10 Fall & Winter?1 WB TV Hwy - Lombard to Murray 17:00 to 18:00 178% -1% Yes2 WB TV Hwy - Lombard to Murray 16:00 to 17:00 146% 14% Yes3 EB Scholls Ferry - Murray to OR 217 7:00 to 8:00 131% -16% Yes4 WB Scholls Ferry - OR 217 to Murray 17:00 to 18:00 125% 5% Yes5 NB Murray - TV to US 26 17:00 to 18:00 119% 9% Yes6 EB Scholls Ferry - Murray to OR 217 8:00 to 9:00 117% 18% No7 WB TV Hwy - Lombard to Murray 15:00 to 16:00 109% 23% No8 WB TV Hwy - Lombard to Murray 18:00 to 19:00 98% 20% No9 EB TV Hwy - Brookwood to Murray 17:00 to 18:00 86% -9% No
10 EB Baseline-Jenkins - Brookwood to Murray 17:00 to 18:00 84% 7% No
Winter 2017 - Feb 20 to Mar 24, 2017
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TIGER Congested Locations (Pk Hr)
Rank (1 = most
congested)
Absolute Percent Over "Free Flow"
(5-6am)Congestion change from
previous seasonTop 10 Fall, Winter &
Spring?1 WB TV Hwy - Lombard to Murray 17:00 to 18:00 160% -18% Yes2 WB Scholls Ferry - OR 217 to Murray 17:00 to 18:00 140% 15% Yes3 EB Scholls Ferry - Murray to OR 217 7:00 to 8:00 134% 3% Yes4 EB Scholls Ferry - Murray to OR 217 8:00 to 9:00 133% 16% No5 WB TV Hwy - Lombard to Murray 16:00 to 17:00 120% -26% Yes6 NB Murray - TV to US 26 17:00 to 18:00 117% -2% Yes7 WB TV Hwy - Murray to Brookwood 13:00 to 14:00 102% 53% No8 WB Scholls Ferry - OR 217 to Murray 16:00 to 17:00 98% -27% No9 EB Scholls Ferry - Murray to OR 217 12:00 to 13:00 92% 18% No10 EB TV Hwy - Murray to Lombard 17:00 to 18:00 89% -13% No
Spring 2017 - April 3 to May 5, 2017
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TIGER Duration of Congestion “Score”
Rank (1 = most
congested) Winter 2017 - Feb 20 to Mar 24, 2017
Aggregrated Sum of Hourly Percentages Over
"Free Flow" (5-6am)
Congestion change from
previous season Top 10 Fall & Winter?1 WB TV Hwy - Lombard to Murray 977.5 144 Yes2 EB Scholls Ferry - Murray to OR 217 945.1 128 Yes3 EB TV Hwy - Murray to Lombard 829.1 -19 Yes4 EB TV Hwy - Brookwood to Murray 703.4 -97.7 Yes5 WB Scholls Ferry - OR 217 to Murray 682.1 -149 Yes6 WB TV Hwy - Murray to Brookwood 653.7 199.6 No7 NB 185th - TV to US 26 621.2 -42.5 Yes8 EB Cornell - 25th to Cornelius Pass 619.2 -314.6 Yes9 NB Murray - TV to US 26 601.9 -12.7 Yes
10 EB Baseline/Jenkins - Brkwd to Murray 601 -2 Yes
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Summary• County has 124 roadside permanent
Bluetooth readers to support • Travel time & Reliability • Running speed, and • Origin-Destination assessments.
• Access to System for Agency Partners
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Thanks to agency partners!
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