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38 determine whether this result is notable (Astucia Traffic Safety High-occupancy-vehicle lane open/closed operational Systems 2007a). status, entrance and exit lane delineation, enforcement areas, and reversible lanes; CONCEPTUAL APPLICATIONS Parking garage guidance to open spaces; and Airport gate lead-ins. While investigating existing IPM systems, several concep- tual applications of IPM systems were uncovered including: These potential applications of IPM systems are still in the conceptual stage and have not yet been field-tested to deter- Fire station exit warning systems; mine their ability to enhance safety, operations, or aesthetics Toll booth open/closed operational status; under these conditions.