This study examines three types of relatively minor freeway improvements, ramp additions, ramp relocations and grade-separated ramps, to determine the magnitude of road user benefits accrued. Delay and travel time data were collected at the site of the ramp additions. Volumes at the new ramp were higher than expected, indicating a latent demand. Annual primary benefits of $162,000 accrued to the users of the new ramps. Secondary benefits in improved upstream intersection operations yielded $7,000 annually. No significant change in accidents resulted. An exit ramp was relocated to eliminate queues onto the main lanes. Accidents were reduced, but not significantly. A grade-separated ramp was constructed to provide new access between arterials that are too closely spaced for at-grade entrance and exit ramps. An annual savings of $143,000 accrued to the users of the new ramp.
Evaluation of Minor Freeway Modifications
1983
76 pages
Report
No indication
English
Freeway modifications to increase traffic flow
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