Abstract: Disclosed is a feature for a vehicle that enables taking precautionary actions in response to conditions on the road network around or ahead of the vehicle, in particular, a speed limit change that occurs between a straight road section and a curved road section. A database that represents the road network is used to determine locations where a speed limit change occurs between a straight road section and a curved road section along a road. Then, precautionary action data is added to the database to indicate a location at which a precautionary action is to be taken about the speed limit change between a straight road section and a curved road section. A precautionary action system installed in a vehicle uses this database, or a database derived therefrom, in combination with a positioning system to determine when the vehicle is at a location that corresponds to the location of a precautionary action.

Abstract: Disclosed is a feature for a vehicle that enables taking precautionary actions in response to conditions on the road network around or ahead of the vehicle. User reports of hazardous conditions along roads are obtained and analyzed to identify reports that pertain to the same general location along a road network. A database that represents the road network is used to confirm the user reports, identify the hazardous condition, and determine locations where precautionary action may be taken. Then, precautionary action data is added to the database to indicate a location at which a precautionary action is to be taken about the user-reported hazardous condition located along the section of road. A precautionary action system installed in a vehicle uses this database, or a database derived therefrom, in combination with a positioning system to determine when the vehicle is at a location that corresponds to the location of a precautionary action.

Abstract: Disclosed is a feature for a vehicle that enables taking precautionary actions in response to conditions on the road network around or ahead of the vehicle, in particular, an intersection located over a hilltop along a section of road. A database that represents the road network is used to determine locations where an intersection located over a hilltop is located along a section of road. Then, precautionary action data is added to the database to indicate a location at which a precautionary action is to be taken about the intersection located over a hilltop located along the section of road. A precautionary action system installed in a vehicle uses this database, or a database derived therefrom, in combination with a positioning system to determine when the vehicle is at a location that corresponds to the location of a precautionary action. When the vehicle is at such a location, a precautionary action is taken by a vehicle system as the vehicle is approaching an intersection located over a hilltop.

Abstract: Disclosed is a feature for a vehicle that enables taking precautionary actions in response to conditions on the road network around or ahead of the vehicle, in particular, a curved portion of a road where the curvature increases between adjacent curved sections. A database that represents the road network is used to determine locations where curvature between adjacent curved sections increases. Then, precautionary action data is added to the database to indicate a location at which a precautionary action is to be taken about the location where curvature increases. A precautionary action system installed in a vehicle uses this database, or a database derived therefrom, in combination with a positioning system to determine when the vehicle is at a location that corresponds to the location of a precautionary action. When the vehicle is at such a location, a precautionary action is taken by a vehicle system as the vehicle is approaching a location where the curvature increases.

Abstract: Disclosed is a feature for a vehicle that enables taking precautionary actions in response to conditions on the road network around or ahead of the vehicle, in particular, a traffic light or stop sign located along a curved section of road. A database that represents the road network is used to determine locations where a traffic light or stop sign is located along a curved section of road. Then, precautionary action data is added to the database to indicate a location at which a precautionary action is to be taken about the stop sign or traffic light located along the curved section of road. A precautionary action system installed in a vehicle uses this database, or a database derived therefrom, in combination with a positioning system to determine when the vehicle is at a location that corresponds to the location of a precautionary action.

Abstract: Disclosed is a feature for a vehicle that enables taking precautionary actions in response to conditions on the road network around or ahead of the vehicle, in particular, an unusually narrow road width or lane width. A database that represents the road network is used to determine locations where an unusually narrow road width or lane width exists along roads. Then, precautionary action data is added to the database to indicate a location at which a precautionary action is to be taken about the location where the unusually narrow road width or lane width exists. A precautionary action system installed in a vehicle uses this database, or a database derived therefrom, in combination with a positioning system to determine when the vehicle is at a location that corresponds to the location of a precautionary action. When the vehicle is at such a location, a precautionary action is taken by a vehicle system as the vehicle is approaching a location where the unusually narrow road width or lane width exists.

Abstract: Disclosed is a feature for a vehicle that enables taking precautionary actions in response to conditions on the road network around or ahead of the vehicle, in particular, a curved portion of a road with insufficient superelevation. A database that represents the road network is used to determine locations where curved sections of roads have insufficient superelevation (banking), i.e., where the superelevation is below a threshold. Then, precautionary action data is added to the database to indicate a location at which a precautionary action is to be taken about the location of insufficient superelevation. A precautionary action system installed in a vehicle uses this database, or a database derived therefrom, in combination with a positioning system to determine when the vehicle is at a location that corresponds to the location of a precautionary action.