RWIS stands for Roadway Weather Information System. ODOT owns 158 weather stations, which provide coverage in all 88 of Ohio's counties. A central service located in Columbus processes the information from each station. ODOT garages use the information collected by the stations to plan their road treatment activities, especially during snow and ice conditions. ODOT also makes road conditions available to the public via the OHGO traveler information web page.

The weather stations and sensors are located along interstates, U.S. routes, and state routes. The system comprises 88 wireless weather stations and more than 160 pavement sensors. Two types of weather stations are installed: those located along highways, and those located at county ODOT offices. The stations reported a variety of information, including:
Air temperature; Precipitation rate/type; Surface temperature; Sub–surface temperature; Wet/dry surface; Dewpoint; Relative humidity; Wind direction and speed; Traffic speeds and counts; Visibility. Data communications between the weather station and the central server at ODOT are conducted via cellular service in 5–minute intervals.


StakeholderRoleRole Status
Ohio Department of Transportation (ODOT)OwnsExisting and Planned
Ohio Department of Transportation (ODOT)OwnsExisting

Physical Objects

ITS Roadway Equipment

Functional Objects

Functional ObjectDescriptionUser Defined
Roadway Data Collection'Roadway Data Collection' collects traffic, road, and environmental conditions information for use in transportation planning, research, and other off–line applications where data quality and completeness take precedence over real–time performance. It includes the sensors, supporting roadside infrastructure, and communications equipment that collects and transfers information to a center for archival.False
Roadway Environmental Monitoring'Roadway Environmental Monitoring' measures environmental conditions and communicates the collected information back to a center where it can be monitored and analyzed or to other field devices to support communications to vehicles. A broad array of general weather and road surface information may be collected. Weather conditions that may be measured include temperature, wind, humidity, precipitation, and visibility. Surface and sub–surface sensors can measure road surface temperature, moisture, icing, salinity, and other measures.False
Roadway Field Device Support'Roadway Field Device Support' monitors the operational status of field devices and detects and reports fault conditions. Consolidated operational status (device status, configuration, and fault information) are reported for resolution and repair. A local interface is provided to field personnel for local monitoring and diagnostics, supporting field maintenance, upgrade, repair, and replacement of field devices.False
Roadway Time Management'Roadway Time Management' provides foundational time keeping functionality that supports an accurate, synchronized time reference in ITS field equipment. It receives accurate time information from an external source and maintains a local time reference using an internal clock in between time synchronizations.False
Roadway Variable Speed Limits'Roadway Variable Speed Limits' includes the field equipment, physical overhead lane signs and associated control electronics that are used to manage and control variable speed limits systems. This equipment monitors traffic and environmental conditions along the roadway. The system can be centrally monitored and controlled by a Traffic Management Center or it can be autonomous, calculating and setting suitable speed limits, usually by lane. This application displays the speed limits and additional information such as basic safety rules and current traffic information to drivers.False

Physical Standards

SDODocument #TitleUser Defined
ITEITE ITS CabinetITS Standard Specification for Roadside CabinetsFalse
NEMANEMA TS 8Cyber and Physical Security for Intelligent Transportation Systems (ITS)False

Interfaces To

(View Context Diagram)

ODOT Connected Vehicle Roadside Equipment
ODOT District Offices
ODOT Variable Speed Limit Signs