References and Suggestions for Equipment Selection in Traffic Weather Monitoring Stations (Weather Detectors)

According to China News Network, data disclosed by the Ministry of Transport on August 24, 2021 showed that as of the end of 2020, China's highway mileage reached 161,000 kilometers, ranking first in the world.

Li Xiaopeng, Minister of Transport, said at a press conference that day that since the 18th National Congress of the Communist Party of China, transportation has made historic achievements. In terms of the comprehensive three-dimensional transportation network, China's national comprehensive three-dimensional transportation network, which uses railways as the backbone, highways as the basis, and gives full play to the comparative advantages of water transportation and civil aviation, is increasingly improving. The main skeleton space of the national comprehensive three-dimensional transportation network with six axes, seven corridors and eight channels has been initially formed. During the "14th Five-Year Plan" period, it is still expected to continue this growth momentum and realize the development of smart transportation in a transportation powerhouse.

my country's highway construction is developing rapidly and carries the important mission of transportation hub. However, as the weather changes, especially severe weather environments such as fog (haze) and icy and snowy roads, it has brought huge safety hazards to vehicles driving on the highway, which not only seriously affects transportation, but also seriously affects people. safety of life and property. Serious traffic accidents involving multiple vehicles colliding head-to-head on highways due to heavy fog, ice and snow have cast a shadow on people's minds.

Cluster fog (haze) has high concentration, small scope, strong suddenness, and strong harm to traffic. It is called "mobile killer on highways." From 22:00 in the evening to 8:00 in the morning is the period of high incidence of cluster fog, among which November to December and January to March are the peak seasons of cluster fog. Due to the sudden appearance of clouds of fog, drivers are caught off guard and lose their vision. They instinctively apply the brakes suddenly, which can easily lead to rear-end collisions. Many multi-vehicle collisions caused by clouds of fog occur across the country every year, causing serious casualties and property losses. Fog (haze), heavy rain, snow, and icy roads have also become the "four major killers" of traffic safety.

Roads and bridges are prone to accumulation of water, snow, ice, and freezing during severe winter weather, causing great safety hazards to driving vehicles. In particular, urban viaducts and bridges across lakes are more likely to freeze, causing high accident rates.

The traffic meteorological monitoring and on-site warning issuance system adopts the operation mode of network and chain monitoring to continuously obtain meteorological information at multiple points along the line, feed it back to the monitoring center, and compare the detection data with predetermined judgment conditions to determine whether there is a group Severe weather such as fog, ice and snow; when severe weather is determined, the predetermined indicator library is called, and the control level of the detection indicator is determined by comparing the detection data with the predetermined indicator library; and then the corresponding call is made from the predetermined strategy library according to the indicator control level. The control strategy is used to cope with the impact of severe weather on the highway, so as to ensure the operation of the highway all-weather.

Meteorological sensors used in traffic weather monitoring stations include:

ASHUR-VD930A visibility weather phenomenon detector

Advantages: Visibility weather phenomenon detector, which can detect visibility and identify current weather phenomena (rain, fog, snow, mixed precipitation, no precipitation, etc.). The recognition rate is greater than 90%.

ASHUR-MWS600 small ultrasonic automatic weather station

Advantages: Overall integration, no mechanical rotating parts; low maintenance cost and high efficiency. The use of ultrasonic technology to measure wind speed and direction reduces daily maintenance workload and the number of trips on the road.

ASHUR-RD3000 laser remote sensing road condition detector

Advantages: non-embedded, non-contact, using spectral analysis technology, roadside pole installation, larger monitoring area and high accuracy. The instrument has its own laser pointer that can locate the monitoring area (lane: passing lane or driving lane). There is no need to cut the road surface, no traffic control on the main road, and low maintenance costs.

It also includes: dedicated comprehensive meteorological data collector, support structure, power supply and communication control box and other units.

The traffic weather monitoring station (weather detector) fully complies with GB/T 33697-2017 "Technical Requirements for Highway Traffic Meteorological Monitoring Facilities". The selected configurations are all considered from the user's perspective. On the one hand, "implementation and practicality" is the basic principle to improve the means of scientific and technological control; on the other hand, it is to reduce the user's workload and reduce maintenance costs.