feasibility study of real time parking information at ... - WMATA.com

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WMATA Real-Time Parking Information Feasibility Study Chapter 6: PILOT PROJECT CONCEPT Figure 6-4 shows the general location of these specialty spaces. Special use parking spaces within the parking structure are easily monitored by overhead detectors, while those located in the surface lots present a greater challenge. Those spaces must be monitored by in-pavement sensors, or potentially via a more indirect technology such as video or microwave/radar. Figure 6-4 Locations of Communications Equipment and Dedicated Spaces ADA Spaces Potential Carpool Spaces North Lot Zone Zone Access / Egress Facility Access / Egress Garage Zone (reserved spaces inside) Comm Room (inside) ADA Spaces South Lot Zone Page 6-6 June 2009
WMATA Real-Time Parking Information Feasibility Study Chapter 6: PILOT PROJECT CONCEPT System Operations This section describes the general operation of the systems and their components. The system components include all of the equipment needed to gather process and transmit information to system users. The detectors monitor movements and changes at the space or zone level. The space controllers process information from the space-level detectors. The system server assembles and processes information from the various system components at each station. Information signs provide information to users at the facility, while communications equipment transmits the information to the WMATA offices. At the WMATA offices, a central parking server monitors information from multiple stations, and the parking web server supplies the information in real time to WMATA’s web servers. Detectors/Sensors The detectors for individual spaces continuously monitor whether the space is occupied or empty. The detectors for ingress and egress to zones (zonal detectors) will monitor all traffic that crosses them. The zonal detectors need to be capable of detecting the direction of travel, and will provide current counts (“ins” minus “outs”). The counters will be checked periodically to verify accuracy. All detectors will communicate with their respective controller continuously to report their status or count. Sensor Controllers The sensor controllers will monitor information from the detectors. For the space detectors, the space sensor controller will know at all times whether the space is occupied or empty. For zonal detectors, the zonal sensor controller will keep a running count of the number of vehicles that have entered and exited that zone. The sensor controllers will communicate with the local server. Local Server The local controller will process information from all of the detectors and subsystems within the facility. All space detectors are located within one of the zones, so the information from the space controller will be matched with the information from the zonal controller, to determine whether a vehicle that entered a zone has parked in a space monitored by a space detector, or whether the vehicle parked in a general parking space not monitored by a space detector. This requires that occupied space counts be compared to total zone counts and known available spaces. The local controller must also be able to determine when the entire facility is approaching and has reached capacity and supply that information to the communications equipment. The local controller will also include an interface for staff to review and adjust the information within the parking system. Parking Information Signs Two types of signs will be provided in two general locations within the parking facility. The first type will be located off the parking facility, and oriented towards approaching traffic from the local arterials. These “external” wayfinding signs will display the number of available spaces by type. This information will assist patrons in their decision to enter Page 6-7 June 2009
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