A vehicle traffic control system , comprising: an emitter configured to flood a detection area with electromagnetic radiation , wherein the detection area comprises a portion of a parking structure ; a detector configured to detect retro-reflected electromagnetic radiation resulting from retro-reflection of the emitted electromagnetic radiation from a plurality of retro-reflective markers disposed within the detection area ; control circuitry communicatively coupled to the emitter and the detector , wherein the control circuitry is configured to monitor the retro-reflected electromagnetic radiation detected by the detector and evaluate information relating to one or more vehicles within the detection area using the monitored retro-reflected electromagnetic radiation ; an automated device communicatively coupled to the control circuitry and configured to provide a user-perceivable indication relating to the one or more vehicles in the detection area , wherein the control circuitry is configured to cause the automated device to provide specific user-perceivable indications upon detecting a change in the retro-reflected electromagnetic radiation; a parking structure having a parking space , wherein the parking space comprises the plurality of retro-reflective markers positioned within an area corresponding to an expected location of a vehicle when the vehicle is parked within the parking space; wherein at least a portion of the detection area comprises the parking space , and the control circuitry is configured to determine whether the parking space is occupied by the vehicle by monitoring retro-reflection by the plurality of retro-reflective markers . wherein the automated device provides a visual indication of the occupancy of the parking space , wherein the control circuitry is configured to trigger the automated device when the parking space is empty or occupied. an emitter configured to flood a detection area with electromagnetic radiation , wherein the detection area comprises a portion of a parking structure ; a detector configured to detect retro-reflected electromagnetic radiation resulting from retro-reflection of the emitted electromagnetic radiation from a plurality of retro-reflective markers disposed within the detection area ; control circuitry communicatively coupled to the emitter and the detector , wherein the control circuitry is configured to monitor the retro-reflected electromagnetic radiation detected by the detector and evaluate information relating to one or more vehicles within the detection area using the monitored retro-reflected electromagnetic radiation ; an automated device communicatively coupled to the control circuitry and configured to provide a user-perceivable indication relating to the one or more vehicles in the detection area , wherein the control circuitry is configured to cause the automated device to provide specific user-perceivable indications upon detecting a change in the retro-reflected electromagnetic radiation; a parking structure having a parking space , wherein the parking space comprises the plurality of retro-reflective markers positioned within an area corresponding to an expected location of a vehicle when the vehicle is parked within the parking space; wherein at least a portion of the detection area comprises the parking space , and the control circuitry is configured to determine whether the parking space is occupied by the vehicle by monitoring retro-reflection by the plurality of retro-reflective markers . wherein the automated device provides a visual indication of the occupancy of the parking space , wherein the control circuitry is configured to trigger the automated device when the parking space is empty or occupied. <EOS>