METHOD AND APPARATUS FOR CAPTURING ROAD CURVE PROPERTIES AND CALCULATING MAXIMUM SAFE ADVISORY SPEED

摘要

This invention relates generally to the field of Highway signage and more specifically to a device for automatically capturing road curve properties and a process for automating calculating the maximum safe Advisory Speed of Roads. This invention is a new device that automates the accurate measurement of road curve/Railway radius and super elevation. This information is assembled to automatically report the recommended curve speed, or Curve Advisor Speed (CAS) for a particular curve. The device is assembled into a single, compact, low power and transportable case which can be driven at normal road speeds in a car.

主权项

1. A device for use in a vehicle travelling on a road having a curve, said device comprising:
a digital inclinometer or accelerometer configured to provide a measured side friction data experienced by the vehicle; a GPS receiver configured to provide a time, a longitude data for the vehicle and a latitude data for the vehicle; and a processor configured to determine a recommended speed for the curve based on the measured side friction data, time, longitude data and latitude data.