Road Weather Data
The Road Weather data API provides real-time calculated driving condition forecasts to any coordinate point in the world. The state of the road’s surface, visibility and other weather events affecting driving are included. Over 40 varieties of driving condition codes are divided into green, yellow and red road segments, representing the severity class.
Vaisala's experts have developed competence in road weather forecasting for many years. These forecasts are trusted in the winter maintenance industry by road authorities in a number of countries. Now, the data is available for other industries as well. The Road Weather data API provides information designed to be from the drivers perspective and as a result is now also being used for autonomous driving purposes.
The Road Weather data API has the capability to provide real-time calculated driving condition forecasts to any coordinate point in the world. The API gives you driving condition information about the state of the road surface, visibility and atmospheric weather events affecting driving. You are able to track both current conditions and forecasts for the roads.
Three Severity Levels
Vaisala offers 40+ variations of codes to express driving conditions. The road condition code is delivered as an integer value, which is mapped into human-readable names in a given language. The codes are divided in three types of classes to express the severity level. The severity level can be tailored to take into account seasonal changes and driving specifics such as an assumed general use of winter tyres. Below is an example of road condition codes used in three severity levels. Please contact us for the complete list of codes.
- Dry road
- Moist road
- Wet road
- Light/moderate rain
- (some slush/snow when winter tires assumed)
- Heavy rain
- Strong winds
- Patches of fog
- Risk of aquaplaning
- Very strong winds
- Risk of damaging hail
- Poor visibility due to: very heavy rain, dense fog, blowing snow, blizzard
- Slippery due to: snow, icy road, water on icy road, slush on road, freezing rain
Driving condition information for the current coordinates of a vehicle, or on a route that consists of several coordinates and projected timestamps, can be queried in XML or JSON formats. The type of road (primary road, secondary road, or bridge) can be provided for a better estimation of the road condition.
Customers that would like to map the road condition information into road segments themselves, can have the forecast data delivered as longitude-latitude grids. These grids are similar to images where each pixel would represent a constant-size square in WGS-84 degrees. Since there can be multiple roads inside the same pixel, nearby roads of different types are covered by providing multiple grids, one per road type (primary road, secondary road, bridge).
Driving conditions data can be delivered in batches of pre-set locations that are updated regularly, usually once per hour. This removes the need to map the data into road segments. Often the simplest way to use the service is to have atmospheric forecasts for points of interest (such as cities) displayed in an infotainment system, separate from the road condition forecast.