Road curve data is data that assigns a numerical value, "curvature," which represents the degree of curvature of the road, and an "azimuth angle," which indicates the direction of that curvature, to each component point on the road network.
This system can be used to identify sharp curves, provide warnings, and search for routes on highways, major arterial roads, and local roads throughout Japan, based on the road structure.
This data is intended for use in a variety of use cases in map visualization and navigation services, such as "visualization of sharp curves," "warning alerts," and "route search that avoids curves."
It is particularly suitable for applications in advanced driver-assistance systems (ADAS) and navigation systems, where it can display voice and icon warnings before approaching sharp curves, thereby supporting the driver's driving behavior.
In operational management and traffic safety measures, it is possible to identify and analyze sections with sharp curves where accidents frequently occur, which can be useful in considering the installation of warning signs and other safety measures.
Road curve data stores information such as the curvature value and azimuth angle of the curve for each road component point.
It can accurately determine the direction of curves and sharp curve sections.
This enables navigation systems and fleet management tools to display warnings and provide voice guidance before sharp curves, supporting drivers' predictive driving.
Road curve data is updated monthly, 12 times a year. This allows for the updating of data on newly constructed roads and changes in road shape.
Road-related information is also handled quickly, ensuring that the latest road curve information is always available.
On the map, sharp curves can be visually represented using curve points placed along road links, with icons and color coding corresponding to the magnitude of the curvature.
For example, by displaying warning marks or symbols indicating the direction of the curve over points where the curvature exceeds a certain level (a value considered to be a sharp curve), users can intuitively understand the location and degree of danger of the curve.
High-quality, high-precision, and highly up-to-date road data covering approximately 1.3 million km across Japan
Speed limit information posted on road signs and road paint markings
Information on locations nationwide prone to traffic accidents
