Safety Performance of High-Occupancy-Vehicle Facilities

Abstract

Collision data from high-occupancy-vehicle (HOV) facilities with two different types of access, continuous and limited, are examined in this paper. The findings show that HOV facilities with limited access offer no safety advantages over those with continuous access. Compared with continuous access HOV lanes, a higher percentage of collisions were concentrated on limited-access HOV lanes. Limited-access HOV lanes also had higher collision rates. Findings from investigating the relationship between collision rates in HOV lanes with respect to shoulder width, length of access, and proximity of access to neighboring ramps are also documented. These findings provide enhanced understanding about the effects of geometric factors on the collision rates in HOV lanes.

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References

Cooner

S. A.

and Ranft

S. E.

. Safety Evaluation of Buffer-Separated High-Occupancy Vehicle Lanes in Texas. In Transportation Research Record: Journal of the Transportation Research Board, No. 1959, Transportation Research Board of the National Academies, Washington, D.C., 2006, pp. 168–177.

Golob

T. F.

Recker

W. W.

and Levine

D. W.

. Safety of High-Occupancy Vehicle Lanes Without Physical Separation. Journal of Transportation Engineering, Vol. 115, No. 6 1989, pp. 591–607.

Sullivan

E. C.

and Devadoss

. High-Occupancy Vehicle Facility Safety in California. In Transportation Research Record 1394, TRB, National Research Council, Washington, D.C., 1993, pp. 49–58.

Case

R. B.

The Safety of Concurrent-Lane HOV Projects. Hampton Roads Planning District Commission, Chesapeake, Va., 1995.

Newman

Nuwarsoo

and May

A. D.

. Operational and Safety Experience with Freeway HOV Facilities in California. In Transportation Research Record 1173, TRB, National Research Council, Washington, D.C., 1988, pp. 18–24.

Freeway Performance Measurement System (PeMS). pems.eecs.berkeley.edu. Accessed Dec. 2007.

Sichel

H. S.

On a Significance Test for Two Poisson Variables. Applied Statistics, Vol. 22, No. 1 1973, pp. 50–58.

Shiue

W. K.

and Bain

L. J.

. Experiment Size and Power Comparisons for Two-Sample Poisson Tests. Applied Statistics, Vol. 31, No. 2 1982, pp. 130–134.

Hauer

Shoulder Width, Shoulder Paving and Safety. Unpublished draft. 2000. ca.geocities.com/hauer@rogers.com/Pubs/Shoulderwidth.pdf. Accessed Oct. 2007.

10.

Gross

and Jovanis

P. P.

. Estimation of the Safety Effectiveness of Lane and Shoulder Width: Case-Control Approach. Journal of Transportation Engineering, Vol. 133, No. 6 2007, pp. 362–369.

11.

Chung

Ragland

D. R.

Madanat

and Oh

. The Continuous Risk Profile Approach for the Identification of High Collision Concentration Locations on Highways. Proc., 18th International Symposium on Transportation and Traffic Theory, Hong Kong, 2009.