managing travel for planned special events - FHWA Operations ...

TACTICRollingroad blockEntrancerampclosureExit rampclosureEliminationofweavingareaRampmeteringLatedivergeprohibitionAdditionalexit ramplaneTable 6-34Interchange Operations Tactics for Planned Special EventsEVENTTIMEAPPLICATIONBENEFIT• Initiate tactic on freeway mainline • Alleviates traffic demand at interchange,Ingress upstream of congested interchangethus permitting street orramp(s).ramp bottleneck to dissipate.EgressIngressEgressIngressEgressIngressEgressIngressEgressIngressIngress• Initiate tactic on freeway mainlineupstream of a congested ramp junctionor weaving area.• Use tactic to meter freeway mainlinetraffic demand without creating a secondarybottleneck upstream of the congestedarea.• Initiate tactic on ramps in close proximityto and upstream of interchangetarget point for event traffic.• Divert affected traffic to anotherdownstream access point.• Initiate tactic as necessary to reducefreeway mainline congestion in the vicinityof closely-spaced entranceramps.• Close ramp, as needed, to alleviatecongestion on a downstream local flowroute.• Initiate only if a downstream exit rampand local street system can handle divertedtraffic.• Initiate tactic at freeway interchangesconnecting local traffic flow routesthat have special egress traffic controlmeasures in effect.• Close cloverleaf interchange entranceramp to facilitate unimpeded divergeto access adjacent exit ramp.• Close cloverleaf interchange exit rampand mainline right-lane to facilitate unimpededmerge with mainline.• Meter freeway entrance ramps upstreamof interchange target point forevent traffic.• Meter freeway entrance ramps downstreamof interchange target point forevent traffic• Deploy traffic cones along barrier lineextending upstream of exit ramp gorearea.• Cone an additional lane on exit rampsserving traffic destined to an eventvenue.• Reduces level of congestion at theprimary bottleneck location.• Eliminates congestion caused bytraffic merging with heavy freewaymainline traffic.• Reduces freeway mainline congestionor prevents congestion from occurring.• Reduces congestion on local flowroute.• Prevents traffic from accessing localflow routes in the direction of theevent venue that operate in favor ofegress traffic flow.• Eliminates weaving area congestion.• Extends deceleration lane for trafficusing exit ramp.• Eliminates weaving area congestion.• Extends acceleration lane for trafficusing entrance ramp.• Reduces congestion caused by trafficmerging with heavy freewaymainline traffic.• Reduces congestion caused by trafficmerging with heavy freewaymainline traffic.• Reduces congestion at diverge rampjunction caused by motorists attemptingto make a sudden lane-change toaccess an exit ramp.• Improves safety.• Provides additional ramp storagecapacity.• Proves particularly effective if twolaneramp traffic does not have tomerge at downstream end of ramp.6-52