feasibility study of real time parking information at ... - WMATA.com
feasibility study of real time parking information at ... - WMATA.com
feasibility study of real time parking information at ... - WMATA.com
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<strong>WMATA</strong> Real-Time Parking<br />
Inform<strong>at</strong>ion Feasibility Study<br />
Chapter 5: OPTIONS AND PREFERRED<br />
SYSTEM FOR <strong>WMATA</strong><br />
Figure 5-9 Summary Decision M<strong>at</strong>rix<br />
Decision Options Preferred<br />
Reasoning<br />
Level <strong>of</strong><br />
Detection<br />
Vehicle<br />
Detection<br />
D<strong>at</strong>a<br />
Communic<strong>at</strong>ion<br />
Traveler<br />
Inform<strong>at</strong>ion<br />
Hybrid Space/Zone<br />
•Full<br />
(if spaces within a facility are all the<br />
• Hybrid Space/Zonal<br />
same type (e.g. unrestricted) then zonal;<br />
• Zoned<br />
if different types <strong>of</strong> spaces are in<br />
• Access/Egress Only<br />
a facility, then space and zonal detection<br />
• In-roadway<br />
• Loops for Zonal Detection in surface<br />
– Loops<br />
lots and garage entrance/exits<br />
– Magnetometers<br />
• Ultrasonic for Space Detection<br />
• Off or Over-roadway<br />
where can have direct overhead mounting<br />
–Ultrasonic<br />
– Passive Infrared<br />
• Video for Space Detection when can mount<br />
– Active Infrared<br />
overhead, but not directly<br />
–Video<br />
• Magnetometers for Space Detection when<br />
–Microwave Radar<br />
cannot mount overhead<br />
• Wireless except for loops th<strong>at</strong> are wired<br />
• Sensor to Processor<br />
• Controller to st<strong>at</strong>ion and st<strong>at</strong>ion to central will use<br />
–Wired<br />
fiber<br />
–Wireless<br />
• <strong>WMATA</strong> to TMA and internal <strong>WMATA</strong> will use<br />
existing <strong>com</strong>munic<strong>at</strong>ions<br />
•Existing <strong>WMATA</strong><br />
Internet and Mobile<br />
Device Applic<strong>at</strong>ions<br />
• Existing <strong>WMATA</strong> Applic<strong>at</strong>ions<br />
• Dynamic Message Signs<br />
(DMS)<br />
•DMS<br />
• Highway Advisory Radio<br />
(HAR)<br />
Most cost-effective<br />
Full space is too costly;<br />
access/egress does not<br />
provide sufficient detail<br />
Accuracy<br />
Loops are best for<br />
measuring moving traffic<br />
Ultrasonic is best for<br />
accuracy <strong>of</strong> space detection<br />
Reduced costs for<br />
connection to detectors<br />
Ease <strong>of</strong> install<strong>at</strong>ion<br />
Comp<strong>at</strong>ibility<br />
Cost-effectiveness<br />
DMS is used because HAR<br />
has agency coordin<strong>at</strong>ion<br />
challenges<br />
Vehicle Detection<br />
The selection <strong>of</strong> loops for zonal detection is based on the need for accuracy. Loops are<br />
better than magnetometers for moving traffic. Space detection requires either <strong>of</strong>f or<br />
over-roadway. Ultrasonic is preferred based on accuracy, but requires install<strong>at</strong>ion<br />
directly overhead. When over-roadway mounting is possible, but not directly overhead,<br />
video is the preferred option. When over-roadway mounting is not feasible,<br />
magnetometers are preferred for space detection.<br />
D<strong>at</strong>a Communic<strong>at</strong>ion<br />
Loop install<strong>at</strong>ion requires wired <strong>com</strong>munic<strong>at</strong>ion, but the preference for all others is<br />
wireless. This is based on reduced cost and ease <strong>of</strong> install<strong>at</strong>ion. Fiber will be used to<br />
<strong>com</strong>munic<strong>at</strong>e d<strong>at</strong>a between the controller and st<strong>at</strong>ion and st<strong>at</strong>ion to central. Existing<br />
<strong>com</strong>munic<strong>at</strong>ions will be used to <strong>com</strong>munic<strong>at</strong>e internally within <strong>WMATA</strong> and from<br />
<strong>WMATA</strong> to transport<strong>at</strong>ion management agency.<br />
Traveler Inform<strong>at</strong>ion<br />
Existing <strong>WMATA</strong> applic<strong>at</strong>ions will be used for internet and mobile device <strong>com</strong>munic<strong>at</strong>ion.<br />
There is the choice <strong>of</strong> DMS or HAR to <strong>com</strong>munic<strong>at</strong>e by other means. <strong>WMATA</strong> believes<br />
th<strong>at</strong> HAR has agency coordin<strong>at</strong>ion challenges and has elected to use DMS.<br />
Page 5-21 June 2009
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