Briefly discuss the phenomenon of gap acceptance with respect to merging and weaving maneuvers in traffic streams.

What will be an ideal response?


Merging is the process of entering a roadway from a minor road or ramp
and weaving is the process of moving across lanes of a major facility. A vehicle
would merge onto a freeway and weave left to reach a left side exit. In the process
of merging and weaving, drivers must assess available gaps in the traffic stream
and determine if they are large enough to move into safely. A gap can be defined
in terms of time or space, and the minimum time or space acceptable to drivers
varies. Based on observations of accepted and rejected gap sizes on a roadway, a
critical gap can be estimated and from this, the expected number of acceptable
gaps can be determined. This value will allow one to calculate the storage space
required on a ramp, or the point at which a signal should be installed at an
unsignalized intersection.

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