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


A15 during evening peak

3/16 Thomas Schreiter: “Dynamisch Verkeersmanagement”

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!


Truck percentage

• A lot more trucks than on other highways


Outline

• The model BOS HbR

•  Control Loop •  3 Components

•  Examples of class-specific Control

• Conclusion

• Review


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


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


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


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


• 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


Class-specific Route Guidance

•  Experiment with simple network •  à less total delay [veh*h]

•  Possible Application for A15:


Class-specific Ramp Metering

•  Prioritize trucks à shorter travel time

trucks à fewer spillback at

on-ramp

•  Prioritize cars à Less total delay


Possible locations for class-specific ramp metering A15


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


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


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


A15 haven-uit: bij Charlois


A.

Homepage met resultaten in realtime www.regiolab-delft.nl/boshbr


www.regiolab-delft.nl/boshbr

• BOS-HbR op computer bij TU Delft

• Vlekkenkaarten •  Snelheid, intensiteit •  A15, beide richtingen •  Schatting, voorspelling


Screenshots – Schatting

Current Speed

Current Flow

Spac

e (3

0km

) à

Sp

ace

(30k

m) à

Time (4h) à


Screenshots – Voorspelling

Spac

e (3

0km

) à

Sp

ace

(30k

m) à

Time (1h) à Current Speed

Current Flow


B.

Resultaten met incident


Resultaten: Incident simulaties

• Voorbeeld: 26 jan 2011 om 16.10

X


• Voorbeeld: 26 jan 2011 om 16.10 •  incident



• Voorbeeld: 26 jan 2011 om 16.10 •  Herrouteren: Wat gebeurd, als het verkeer over het onderliggende wegennet

geherrouteerd wordt?


dynamic traffic management: class specific control at the a15; thomas schreiter

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