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http://onlinepubs.trb.org...trr/1991/1303/1303-010.pdf

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The cost-effectiveness of roadside improvements was compared with road improvements on two-lane rural highways in Illinois. Accident reductions due to the improvements on 17 resurfacing, restoration, and rehabilitation projects were determined, and the benefits from the accident reductions were compared with the improvement costs. Accident data for 2 years before and 2 years after the improvements were extracted for two categories: (a) fixed-object, off-roadway, single-vehicle (FOS) accidents and (b) related accidents, which include overturned, other noncollision, head-on, and sideswipe accidents in addition to the FOS accidents. The roadside improvement costs were used in a benefit/cost analysis of the FOS accidents, and the road improvement costs were used in a benefit/cost analysis of the related accidents. Benefits, in terms of number of accidents reduced, were computed using the before-and-after study with control site approach. Roadside improvements reduced accidents by 7.02 per year, road improvements by 33.35 accidents per year. On the average, for every $28,471 spent on the roadside improvement, or for every $26,487 spent on the road improvement projects, one accident was reduced. The benefit/cost ratios for roadside improvements were very similar to those for road improvements. The cost-effectiveness approach and benefit/cost analysis indicated that the roadside improvements provided similar benefits to the road improvements. A more comprehensive study with a larger number of sites is suggested to evaluate the cost-effectiveness of highway improvements over a longer period of time.

This paper appears in Transportation Research Record No. 1303, Geometric Design Considerations 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01407113

p. 92-102

1991

Transportation Research Record

030905110X

References (21) ; Tables (9)

Alternatives analysis; Before and after studies; Benefit cost analysis; Cost effectiveness; Highway planning; Highway safety; Improvements; Roadside improvement; Rural highways; Safety; Traffic safety; Two lane highways

Road improvements

Design; Highways; Safety and Human Factors; I20: Design and Planning of Transport Infrastructure

TRIS, TRB, ATRI

Nov 30 1991 12:00AM

• EFFECTS OF DESIGN CRITERIA ON LOCAL STREET SIGHT DISTANCE
• GAPS ACCEPTED AT STOP-CONTROLLED INTERSECTIONS
• LATERAL CLEARANCE TO VISION OBSTACLES ON HORIZONTAL CURVES
• SAFETY CONSIDERATIONS FOR TRUCK CLIMBING LANES ON RURAL HIGHWAYS
• SIDE FRICTION DEMAND VERSUS SIDE FRICTION ASSUMED FOR CURVE DESIGN ON TWO-LANE RURAL HIGHWAYS
• SIGHT DISTANCE MODEL FOR UNSYMMETRICAL CREST CURVES (WITH DISCUSSION AND CLOSURE)
• SIGHT DISTANCE MODELS FOR UNSYMMETRICAL SAG CURVES
• SOME TRAFFIC PARAMETERS FOR THE EVALUATION OF THE SINGLE-POINT DIAMOND INTERCHANGE
• SUPERELEVATION AND BODY ROLL EFFECTS ON OFFTRACKING OF LARGE TRUCKS
• TRAFFIC PERFORMANCE AND DESIGN OF PASSING LANES
• WARRANTS FOR PASSING LANES