Quantitative Evaluation of Fully Actuated versus Nonactuated Coordinated Phases

Abstract

Intersections on coordinated arterials typically run in a semiactuated mode, where the end of green for the coordinated phases is fixed in time. During cycles when demand for the coordinated phases is low, the intersection tends to become idle while vehicles wait on minor movements. Actuating a portion at the end of the coordinated phase enables the controller to allocate the green time in response to demand for the coordinated movement. Green time is reallocated to other phases when demand for the coordinated movement is low but is retained by the coordinated movement when demand is high. The operational impacts of actuating the last 9.6 to 11.6 s of the coordinated phases (10% of cycle) at an actuated intersection are investigated by using cycle-by-cycle calculations of measures of effectiveness. The use of fully actuated instead of nonactuated coordinated phases can better balance volume-to-capacity ratios and decrease split failures for minor street movements without major impacts on progression through the coordinated movements. It is recommended that agencies consider actuating coordinated phases to provide robust control that more effectively responds to changing traffic conditions.

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References

Berry

D. S.

Field Measurement of Delay at Signalized Intersections. In Highway Research Board Proceedings, Vol. 35, Washington, D.C., 1956, pp. 505–522.

Ficklin

N. C.

For and Against Semi-Actuated Traffic Signal Control. Traffic Engineering, Vol. 43, No. 6 1973, pp. 20–25.

Jovanis

P. P.

and Gregor

J. A.

Coordination of Actuated Arterial Traffic Signal Systems. Journal of Transportation Engineering, Vol. 112, No. 4 1986, pp. 416–432.

Chang

E. C.-P.

and Koothrappally

Field Verification of Coordinated Actuated Control. In Transportation Research Record 1456, TRB, National Research Council, Washington, D.C., 1994, pp. 83–90.

Chaudhary

N. A.

and Balke

K. N.

Real-Time Coordinated-Actuated Traffic Control During Congested Conditions. FHWA/TX-99/1288-S. Texas Transportation Institute, Texas A&M University, College Station, 1997.

Skabardonis

Bertini

R. L.

and Gallagher

B. R.

Development and Application of Control Strategies for Signalized Intersections in Coordinated Systems. In Transportation Research Record 1634, TRB, National Research Council, Washington, D.C., 1998, pp. 110–117.

Khatib

Abdel-Rahim

Judd

and Jagarapu

Actuated Coordinated Signalized System. National Institute for Advanced Transportation Technology (NIATT) Report N01-20. Prepared for U.S. Department of Transportation, 2001.

De Castro-Neto

M. M.

Urbanik

II and Han

L. D.

Noncoordinated Phases in Coordinated Traffic Signal System: Evaluation of Alternative Permissive Periods on Performance. In Transportation Research Record: Journal of the Transportation Research Board, No. 1978, Transportation Research Board of the National Academies, Washington, D.C., 2006, pp. 8–15.

Chang

E. C.-P.

Guidelines for Actuated Controllers in Coordinated Systems. In Transportation Research Record 1554, TRB, National Research Council, Washington, D.C., 1996, pp. 61–73.

10.

Smaglik

E. J.

Bullock

D. M.

and Urbanik

II. Evaluation of Lane-by-Lane Vehicle Detection for Actuated Controllers Serving Multilane Approaches. In Transportation Research Record: Journal of the Transportation Research Board, No. 1925, Transportation Research Board of the National Academies, Washington, D.C., 2005, pp. 123–133.

11.

Smaglik

E. J.

Bullock

D. M.

and Sharma

Pilot Study on Real-Time Calculation of Arrival Type for Assessment of Arterial Performance. Journal of Transportation Engineering, Vol. 133, No. 7 2007, pp. 415–422.

12.

Smaglik

E. J.

Sharma

Bullock

D. M.

Sturdevant

J. R.

and Duncan

Event-Based Data Collection for Generating Actuated Controller Performance Measures. In Transportation Research Record: Journal of the Transportation Research Board, No. 2035, Transportation Research Board of the National Academies, Washington, D.C., 2007, pp. 97–106.

13.

Smaglik

E. J.

Bullock

D. M.

Sturdevant

J. R.

and Urbanik

II. Implementation of Lane-by-Lane Detection at Actuated Controlled Intersections. In Transportation Research Record: Journal of the Transportation Research Board, No. 2035, Transportation Research Board of the National Academies, Washington, D.C., 2007, pp. 81–87.

14.

Highway Capacity Manual. TRB, National Research Council, Washington, D.C., 2000.

15.

Smaglik

E. J.

Bullock

D. M.

and Urbanik

II. Adaptive Split Control Using Enhanced Detector Data. In Proc., 2005 ITE International Annual Meeting and Exhibit, Melbourne, Australia, August 7. Institute of Transportation Engineers, Washington, D.C., 2005, pp. 123–133.