Road Weather Stations & Road Sensors
Definitive Guide -2019

The layout of expressway traffic and weather monitoring network in these areas is mainly caused by low visibility fog. The basic layout principle is:

First, for a plain or hilly area, when considering fog disaster, the density of meteorological observation stations can be divided into three categories.

The distance between observation stations is 20 to 50Km in dense fog area.

The distance between observation stations in seasonal heavy fog area is 10 ~ 15Km.

The distance between observation stations in mountainous area and water network area is 3 to 5Km.

Second, for areas with complex terrain such as high mountain terrain, the density setting of the observation station should mainly consider the key points and the regional range that one observation point may represent.

The setting density of the traffic meteorological observation station should be treated with similar methods when considering other meteorological elements.

In particular, the “local” characteristics of some meteorological disasters should be more obvious, and the setting density of the observation stations should be strengthened.

In the case of limited funds and conditions, priority should be placed in the high-risk sections such as fog. All monitoring stations should include visibility factor.

In high altitude, plateau and other desert areas, the layout of the observation network along the highway should take sand dust storm and wind as the main consideration. The basic layout principles are as follows:

The distance between monitoring stations is 20 ~ 30km in Sandstorm and windy areas.

The distance between monitoring stations is 30 ~ 100km in sandstorms and windy areas.

Easily caused by topography frequent sandstorms or local highway across regions, should be laid in the wind observation station encryption.

In the case of limited funds and conditions, priority should be placed in such areas as sandstorms and other severe weather. All monitoring stations should include visibility factors.

The layout of the meteorological observation network along the expressway is mainly based on the area, snow and freezing.

The basic layout principles are as follows:

In winter, the temperature of winter is lower than 0 centigrade and snowfall.

The monitoring station is designed to monitor the ground area snow, ground freezing and friction coefficient, and the distance is 30 ~ 50km.

When there is not much snow, but in winter, the main factor of monitoring is the road friction coefficient. The spacing between stations can be set to 50 to 80km.

The area where ice skid is easy to cause skidding can increase the number of equipment appropriately.

In the case of limited funds and conditions, priority should be placed in the frequent snowfall.

All monitoring stations should include ground condition elements, with emphasis on monitoring land surface temperature, precipitation property, area snow depth, friction coefficient and so on.

For areas such as mountain, valley, hilly and other special terrain as well as a variety of disaster weather, the main influencing factors are analyzed according to different terrain and climate background, and the automatic station with high influence factors is set up after determining the main monitoring indexes.

The layout of the density is based on the scale and scope of the influence of the disaster weather.

Some sites should include pavement condition monitoring, which are mainly installed on large bridges and overpasses through the expressway, and should also be installed in the key areas where the expressway is prone to high temperature and ice.

Pavement condition monitoring can choose sensors installed on monitoring road surface temperature or combination elements according to the local road surface temperature and ice occurrence.

The site layout of the road condition monitoring site is equipped with the density of the distance 30-50km, and the monitoring equipment should be added to the section of the large bridge, the elevated interchange and the local ice phenomenon.