Road Weather Information System (RWIS)

NDDOT Road Weather Information System (RWIS)

Map View for RWIS (ND Roadway Information System)

Table View for RWIS (ND Roadway Information System)

Example image of Travel Map Legend
Typical ESS


Have you ever noticed equipment next to a highway, which looked like a small weather station, and wondered about its purpose?


These “weather stations” are called environmental sensor stations (ESS). A network of ESS make up a road weather information system (RWIS). The North Dakota Department of Transportation (NDDOT) is one of many state DOT’s across the country which utilizes RWIS as a tool to obtain road weather information and aid in decision making.


An ESS contains sensors which measure atmospheric and pavement conditions at locations across North Dakota. Here are some examples of data which can be obtained from ESS:


Atmospheric data:

  • Air temperature
  • Humidity
  • Visibility distance
  • Wind speed and direction
  • Precipitation type and rate


Pavement data:

  • Pavement temperature
  • Pavement condition (Ex: wet, icy)
  • Subsurface conditions (Ex: soil temperature)


Environmental sensor stations are also available for public use. Click the link on this page to view the NDDOT RWIS map. ESS will appear as triangles on the RWIS map, as shown in the image below.

Example image of New Town Camera during a winter storm
NDDOT Road Weather Information System (RWIS) Map