Dynamic Traffic Management: Class specific control at the A15; Thomas Schreiter
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Transcript of Dynamic Traffic Management: Class specific control at the A15; Thomas Schreiter
Challenge the future Delft University of Technology
Dynamic Traffic Management: Class-specific Control at de A15 Thomas Schreiter, Hans van Lint, Serge Hoogendoorn, Zlatan Muhurdarević, Ernst Scheerder
Goal: 40 km in 38 min
Challenge the future Delft University of Technology
A15 during evening peak
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Class-specific Vehicle Length
• More jam ßà “longer” trucks (in relative terms) • Worsening effect
• Person-car equivalent (pce) value • Effective density = pce * density • Dynamic, dependent on traffic state!
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Truck percentage
• A lot more trucks than on other highways
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Outline
• The model BOS HbR
• Control Loop • 3 Components
• Examples of class-specific Control
• Conclusion
• Review
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BOS-HbR (“Beslissingsondersteunend Systeem voor het Havenbedrijf Rotterdam”)
BOS HbR
Traffic System A15
Sensors Actuators
Real-time Control
Real-time Prediction
Real-time Estimation
Network
Historic inflows / outflows
0u uk qt x
∂ ∂+ =
∂ ∂
Traffic model
Goalfunction Travel time <= 38min
Vehicle properties
l = 20 m vmax =85 km/u
l = 6 m vmax =110 km/u
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Estimation: traffic state now • Given: induction loops
• Flow [veh/uur], Speed • Every ~500 m and 60 sec
• Needed: 1. Density [vtg/km] every 100 m
• Apply filter “Check”
2. Traffic composition • Historic microscopic loop data
10:30 5:30 8:00 now Past
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Prediction: traffic state during next 1 hour
• Traffic Flow Model: “Fastlane” • Road segmented into cells of 100 m, time step 3 sec • Density(t+1) = Density(t) + Inflow(t) – Outflow(t) • Simulation of incidents
Inflow Turnfraction Fundamental Diagram
10%
200 veh/h
Incident
• Class-specific: trucks and cars
Dichtheid
Inte
nsite
it
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Prediction: traffic state during next 1 hour
• Results Prediction • Density, flow, speed • Location of congestion • Travel times
10:30 5:30 8:00 now Past Prediction
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• Model predictive control (MPC) • Predict effect of DTM measurement • Choose best DTM measurement • In realtime
• Example: class-specific route guidance during incident:
Control: Optimization of Traffic for each vehicle class
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Class-specific Route Guidance
• Experiment with simple network • à less total delay [veh*h]
• Possible Application for A15:
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Class-specific Ramp Metering
• Prioritize trucks à shorter travel time
trucks à fewer spillback at
on-ramp
• Prioritize cars à Less total delay
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Possible locations for class-specific ramp metering A15
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Conclusion
• Dynamic Traffic Management • Goal: improve traffic state during incidents
• By prediction of expected traffic situation • Predict jam locations • Class-specific control improves traffic state
BOS-HbR (“Beslissingsondersteunend Systeem voor het Havenbedrijf Rotterdam”)
Traffic System A15
Sensors Actuators
Real-time Control
Real-time Prediction
Real-time Estimation
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My Review
start 3 months later 4th year Dissertation
Mid of 3rd to beginning of 4th year
3rd year Control
Still busy with calibration
2nd year Prediction
1.5 years 1st year Estimation
Reality Planning
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My Review
• Good • Culture: open, freedom, honesty, relaxed • Theory and application • Exciting topic • Helicopter flights J
• Tough • Culture • Dutch at TUD and sponsors • Getting distracted by other interesting research topics
Challenge the future Delft University of Technology
A15 haven-uit: bij Charlois
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A.
Homepage met resultaten in realtime www.regiolab-delft.nl/boshbr
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www.regiolab-delft.nl/boshbr
• BOS-HbR op computer bij TU Delft
• Vlekkenkaarten • Snelheid, intensiteit • A15, beide richtingen • Schatting, voorspelling
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Screenshots – Schatting
Current Speed
Current Flow
Spac
e (3
0km
) à
Sp
ace
(30k
m) à
Time (4h) à
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Screenshots – Voorspelling
Spac
e (3
0km
) à
Sp
ace
(30k
m) à
Time (1h) à Current Speed
Current Flow
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B.
Resultaten met incident
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Resultaten: Incident simulaties
• Voorbeeld: 26 jan 2011 om 16.10
X
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• Voorbeeld: 26 jan 2011 om 16.10 • incident
Resultaten: Incident simulaties
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• Voorbeeld: 26 jan 2011 om 16.10 • Herrouteren: Wat gebeurd, als het verkeer over het onderliggende wegennet
geherrouteerd wordt?
Resultaten: Incident simulaties