Scott Shepard, Director of North American Business Development at ARS T&TT in the Netherlands, discussed best practices for the assessment and replacement of traffic sensors in the best traffic management, and strongly recommended the Dutch National Database (Dutch Natio nal Data Warehouse) as a typical case...
According to James Consulting, the Netherlands has been constantly innovating in obtaining traffic management data due to factors such as urbanization, road congestion and road network complexity. Applying the latest sensing technologies (laser, acoustic fibers, virtual coils, etc.) is at the heart of innovation.
According to the Minister of Transportation, Public Works and Water Management, the Netherlands is one of the most densely populated countries in the European Union and the world. The Netherlands is the sixth largest economy in Europe and is seen as a logistics gateway to Europe. Therefore, accessibility is not only a basic function, but circulation ability also plays an indispensable role. As a result, the Netherlands has a long tradition of technological innovation in transport management, which has led to a global trend towards this issue.
The Netherlands has the world's most advanced highway network, and most highway networks are equipped with variable message signs and electronic lights. As of 2004, electronic traffic lights have been installed on 980 km of expressways.
Traffic management and perception
Traffic management ensures the optimal performance of the road network and the effective handling of accidents. Sound traffic management is a must for measuring and monitoring road conditions on all road networks, helping to analyze data and take action to reduce congestion and minimize incident response time. Any intelligent traffic control system to achieve tracking of the entire road network situation, with a comprehensive and efficient traffic monitoring and monitoring system is a prerequisite. Therefore, various sensors are installed on both sides and above the road to obtain the necessary geographical location and critical time coverage. These sensors include: induction coils, non-intrusive traffic detection devices, cameras, and video image processing.
Sensor replacement and data fusion
ARS T&TT uses multiple traffic sensors to work simultaneously, each with unique characteristics to determine which sensor or combination type best meets the customer's needs and achieves the best results. For example, Bluetooth, GPS, coils, and radar are sensors that are useful for analyzing speed, travel time, and traffic flow intensity. Currently, the blue traffic sensor of Figure 1, the traffic video sensor of Figure 2 (ANPR, ADR), and the coil detector, virtual coil detector, GPS sensor, radar detector, floating car data, and third party data shown in Figure 3. Both are used as sources of traffic data. Third-party weather forecasts, school and public holiday information, and traffic sensor data can accurately predict travel time.
From left to right, are: Figure 1 blue traffic sensor, Figure 2 traffic video sensor, Figure 3 coil detection system
Sensor replacement status
In support of traffic management innovation in the Netherlands, traffic sensor assessment, calibration, replacement and/or upgrades have been carried out nationwide over the past decade. The following are examples of traffic sensor replacement projects, including details such as location and size:
Department of Justice, Department of Transportation: ARS T&TT takes over 400 to 450 automatic traffic counters (coils) and upgrades all locations to stand-alone (powered by solar panels and air communications);
Automatic License Plate Recognition (ANPR) cameras in Rotterdam: approximately 270 new ANPR cameras replace existing camera networks;
Flevoland coil counter: Approximately 70 LDS technology devices replace the original coil counter;
Coil counter in Rotterdam: Approximately 200 LDS technology devices replace the original coil counters;
North Brabant Province: Beginning to phase out the coils, instead installing the radar in 68 permanent locations and 110 periodic flow locations with defective induction loops.
Sensor replacement
NDW user case analysis
The Dutch National Database (NDW) is the first nationally implemented country in the world to receive nearly 10 million traffic data updates from all over the country.
NDW's online data services include traffic flow intensity, vehicle classification, speed, travel time estimates, and actual travel time statistics. NDW covers nearly 10,000 kilometers of highways, national highways and urban roads in the Netherlands.
The NDW data is distributed to all traffic information service providers and major road operators in the Netherlands. The database is hosted in the Tier 4 data center with nearly 100% availability and redundancy to avoid single points of failure. The time series of traffic data obtained from various traffic monitoring sources will be entered into the traffic database (including historical and real-time traffic information). Through the data set, high-quality traffic information prediction is obtained through filtering and data fusion algorithms, and the results are applied to traffic information, traffic management and traffic engineering.
The latest sensor technology
In order to achieve effective transportation management in the Netherlands, it is very important to explore and utilize the latest sensor technologies . Fiber is one of the latest sensing technologies laid out on the roadside.
Fiber optic sensors are used in two ways: to detect pressure (load) and to detect vibration. In the Netherlands, vehicle classification is based primarily on the combination of length and vehicle shape. This means that sensors that measure the wheel path have little meaning in monitoring the car except for temporary measurements.
Measuring vibration using fiber optics is a recognized technology, but it is currently not suitable for vehicle testing. Currently, an experiment is being carried out on the roads in the Netherlands, where fibers are used to estimate the longitudinal frequency distribution along the road. This is based on the assumption that a high percentage of low frequency conditions indicates a low speed. The advantage is that these sensors can be installed next to the road and they are well protected from the harsh weather and therefore low maintenance costs.
in conclusion
The traffic sensors currently deployed in the Netherlands use the most advanced technology in the world today. Collect accurate traffic data, define the condition of the road network, traffic conditions, information about road conditions and the immediate environment, which is a prerequisite for the operation of the road network. Traffic data, weather conditions, accidents, other road and highway status alerts are used to provide intelligence for network operations activities, traffic control, and information systems. This process of collecting data is called network monitoring and relies on accurate and efficient traffic sensors to acquire, transmit, and plan operational activities, making management and control possible. The quality of the information that provides traffic management functions to travelers and road users nationwide is ultimately determined.
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