Optimalization of Traffic Management in cities based on Satellite Positioning System

Czech Republic participation in the Galileo

Pilot project

ELTODO EG, a.s.

Optimalization of Traffic Management in cities based

on Satellite Positioning System

Prof. Dr. Pavel Pribyl

Pilot project: Optimalization of Traffic Management Based on Satellite Positioning System

Czech Republic in Galileo

Characteristic of project

Research project No. 802/210/112 Founded by Ministry of Transport Proposed for 6 years (2001-2006)

“Participation of the Czech Republic in the Galileo Project”

Optimalization of traffic management in the cities – New procedure based on queue length– Queue length estimation based on model and FC– Traffic accident automatic identification

GPS signal ability in the city corridors



Traffic control in the cities - detectors

Traffic Responsive Control– time gap between cars

presence (TRC) 40 m

Traffic adaptive control– macroscopic parameters

strategic (TAC) 100 m

Level of services



Traffic control in the cities

Parameter (LOS ,LDET)

Information power transferred to traffic controllers



Traffic control in the oversaturated networks

Queue length extension to the previous crossing

Blocking of collision directions

Domino effect

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New procedure of traffic control

Input parameters – queue length– priority of directions– capacity of stages

Procedure– Identification of an area– Lane priorities– Cycle time calculation– Offset calculation– Split optimalization

Capacity of stage:

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New procedure of traffic control - algorithm

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Cycle timecalculation

Split optimalization

Queue lengthestimation

FC data



Queue length by floating cars

Number of FC depends on accuracy of TT estimation Probabilistic theory

Strakonická street – 1800 m, 2 traffic controllers– TT actualization in 15 minutes … 20 FC/90 %

Radlicka street – 500 m, 4 traffic controllers– … 36 FC

Traffic controllers/

1500 m

90 % accuracy

+/- 10 % failure

95 % accuracy

+/- 10 % failure

90 % accuracy

+/- 5 % failure

less 3 5 6 15

3 - 6 6 8 25

more 6 9 12 37



Queue length estimation – data and FC

Legth of the queue of cars

1

2

3 4

5

6

Hybrid model- Time development of occupancy- Hydrodynamic analogy - Verification by FC

Hybrid model- Time development of occupancy- Hydrodynamic analogy - Verification by FC



Pilot evaluation – crossing Nr. 4.421

Control algorithm based on queue length (simplified)– SSZ 4.421, traffic problems, queues in both direction– WiFi communication to the traffic centre

Ordinary improvement in travel time 5-10 %

Pilot project in the 2005 – 6 crossings



Floating car measurement (15 hours) Stationary measurement (2 x 24 hours)

Evaluation– Number of satellites– Parameter DOP– Inaccuracy of position

Measurement in the city corridors (1)




Evaluation of FC



Conclusions

The method of city management based on queues estimation is very actual

Reduction of number of FC is necessity

but !!! FC data for verification of queue length are essential

The experiences will be available before Galileo will be launched (… very important)

Zpět



Thank youPavel Pribyl

[email protected]

Optimalization of Traffic Management in cities based on Satellite Positioning System

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