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The active car-detecting sensors network system in San Francisco can know when the parking system is used to the maximum, determine whether it is appropriate to increase the cost, and understand where and when the driver did not pay for parking.
In order to investigate the use of parking spaces on the road and to understand whether drivers are paying, the Port of San Francisco and the Municipal Transportation Agency of San Francisco have developed an active wireless sensor network system to monitor the location and time of parking.
In November 2006, San Francisco conducted an experiment using software, hardware and data management systems provided by Streetline Networks to track 200 parking spaces near Fisherman’s Wharf and Embarcadero Parking time. At the same time, the system tracks when the car leaves the parking space, and then uses the data information obtained to compare with the actual payment amount to determine whether parking is paid. In addition, the city has installed 30 other sensors next to the parking space where the meter is installed at the intersection of the Columbus Avenue near the city center. A few weeks ago, the 200 sensors installed at Fisherman’s Wharf and Embacardio were removed, but the 30 sensors on Columbus Avenue will be used by the end of the month.
The Streetline sensor uses wireless network accessories provided by Dust Networks in Hayward, Calif. The sensor is packaged in a plastic shell, similar in shape and size to a common reflector on the road, and fixed on the road with standard pavement epoxy resin, one for each parking space. Streetline CEO and partner of Dust Networks Tod Dykstra said that the system includes an ultra-micro power transceiver that can operate in the 2.4-2.5GHz and 902-928MHz ranges, and a power supply that can support 5-10 years. The sensor transmits the unique ID number and parking-related data information to other sensors and gateway receivers through the Time Synchronized Mesh Protocol, which is patented by Dust Networks.
When the sensor monitors that the car occupies the allocated parking space, it transmits the data information to the nearby sensors. These sensors continue to transmit the information forward until it reaches the Streetline gateway, which is usually installed on a street lamp post. The gateway is connected via a cellular connection and further transmits the information to a network server. As soon as the car drives away, the sensor will send a message that the parking space is free. The same sensor can also be used to monitor the traffic flow of nearby traffic lines and provide detailed information about the traffic flow at a specific location at a specific time. The Streetline software system analyzes the data and regularly sends reports to the city of San Francisco through the Internet interface.
Bryant Woo, an assistant engineer at the Department of Parking Traffic in San Francisco, said: “We can know the number of parking spaces that are used and unused.” This data allows the city to know when the parking system is used to its maximum. , When is it appropriate to increase parking fees, and where and when the driver did not pay for parking. If necessary, the city can send executive officials to a specific location at a certain time every week or every day.
In some areas of San Francisco, billing tables that used to only accept coins are now being converted to billing tables that also accept banknotes and even credit cards. This change stems from the increase in parking fees in the City of San Francisco, from $1.5 per hour to $3 per hour. Woo said that in this case, it is difficult for the driver to collect enough change. The sensor can reflect the driver’s use of parking spaces under the new charging standards.
Woo said that with this data information, the city can observe the use of parking spaces and the rate of car turnover to determine whether the time limit needs to be changed. Streetline provided San Francisco with a graphical illustration of the use of the parking system in a special area, showing when and how long the parking is free.
The Streetline system can be electronically connected to the parking meter, so that the city can know the location of the meter and the amount of money in the first time. Dykstra said: “In addition to collecting data and information, we also provide related services to control the meter. For example, we can remotely reset the broken meter system and greatly reduce maintenance costs.” However, until now, San Francisco Have not decided to use the service yet.
Woo revealed that San Francisco plans to remove the last 30 sensors at the end of September and then study the results of the test. Finally, he said that he hopes to see that consumers can use their mobile phones to make calls to pay for parking. The specific procedure is to use their mobile phones to call the system and recharge in an account. Hope that one day, consumers can use the GPS system and web server on the car to know the exact location of the free parking space. But now, San Francisco has no plans to test such a system.
Los Angeles also tested the Streetline system in 100 parking spaces in the Toy District. The test lasted from April to mid-August this year.
Regarding these two trials, Dykstra said: “This is really an extraordinary success, which makes people feel exceptionally surprised.” “Parking is a complex social activity and an important part of the local economy. As drivers, most of us People see him as an annoying thing, the sooner you forget the better, but as an example of using rare resources in public places, it is indeed eye-catching. It also applies to retail, land use, commercial real estate, And provide the quality of life of urban residents.
Streetline’s standard pricing is US$300 per sensor and US$150 per meter monitor, including installation costs and 10-month service fees for each device.
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