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Effects of Off-Ramps on Freeway Operation
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1965-10-01
[PDF-4.80 MB]
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Edition:Final Report
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Abstract:Studies have indicated that the off-ramp is a critical element of a freeway facility and can contribute significantly to both desirable and undesirable operations. If maximum efficiency is to be obtained from a freeway, the off-ramps must be located, designed, and operated to minimize any adverse effects on main-lane freeway flow and to permit maximum utilization of the facility. The original objectives of the offramp project were to evaluate the effect on freeway operation of (1) the frequency of off-ramps and (2) various arrangements of off-ramps. Studies of the off-ramp problem led to the conclusion that the objective of the offramp project should be expanded to study the total effect of off-ramps rather than the more narrow scope of considering only frequency and arrangement. Consideration of the problem resulted in the definition of several factors of off-ramp location design, and operation that could affect the operation of the freeway. These factors are enumerated as follows: (1) deceleration distance, (2) off-ramp capacity o (3) short trip generation, (4) weaving maneuvers, (5) access control and (6) access provision.
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