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Citation |
Bonneson JA, McCoy PT, Eitel DS. Transp. Res. Rec. 1993; 1395: 39-47. |
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Copyright |
(Copyright © 1993, Transportation Research Board, National Research Council, National Academy of Sciences USA, Publisher SAGE Publishing) |
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DOI |
unavailable |
PMID |
unavailable |
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Abstract |
The economic benefits and costs of replacing a two-way stop-controlled intersection on a rural expressway with either a signalized intersection or a conventional diamond interchange were compared. Economic benefits were based on the difference in road user costs among alternatives. Road user costs were composed of five components: delay, idle fuel, acceleration-deceleration delay, speed-change running costs, and accident costs. The benefit-cost analysis of the signalized intersection and interchange under rural expressway conditions indicated that the interchange was a more economically viable alternative than the signalized intersection. The signalized intersection's main benefit is a reduction in accidents; however, this benefit is generally negated by the signal's higher operational costs whenever the minor road demand is less than one-half that of the major road. Three geometric scenarios were formulated for the intersection and interchange. The first considered a four-leg junction with a two-lane minor road. The second considered a four-leg junction with a four-lane minor road. The third considered a three-leg junction with a two-lane minor road. Three figures were developed relating the major and minor road daily traffic demands that would economically justify an interchange in terms of a benefit-cost ratio. Whenever the major road demand is about 4,000 vehicles per day (vpd) or more, the minor road demands that provide a 2.0 benefit-cost ratio are about 4,000, 6,500, and 8,000 vpd for the three scenarios, respectively. Language: en |
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Keywords |
Accidents; Costs; Economics; Highway accidents; Intersections; Highway engineering; Highway traffic control; Roads and streets; Motor transportation; Highway systems; Interchanges |