What elements typically exist to define a “Bottleneck”?
The LBR Program focuses on operationally influenced locations; that is to say, those that have an identifiable cause, resulting in recurring delays of generally predictable times and durations. The root cause of traffic flow degradation at the subject point of constriction is a potentially correctable solution. The following conditions either exist or help to identify a recurring bottleneck condition. • A traffic queue upstream of the bottleneck, wherein speeds are below free-flow conditions elsewhere on the facility. (Note: if speeds at all or most-all of the facility are consistently and regularly lower than free-flow speeds, then overarching congestion exists. This is congestion beyond a mere point-specific bottleneck location.) • A beginning point for a queue. There should be a definable point that separates upstream and downstream conditions. The geometry of that point is often coincidently the root cause of the operational deficiency. • Free flow traffic conditions downstream of
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