Known as the 'angle difference method', the system was developed by a team led by Prof. Anthony Yeh Gar-On. It utilises an in-vehicle smartphone running a navigation app, which is linked by Bluetooth to the car's built-in or plug-in onboard diagnostic device. The angle at which the phone is mounted doesn't matter, as an initial calibration process that is performed on level ground compensates for it.
When the car enters the on-ramp for an overpass, the system automatically detects the change in the vehicle's inclination. It compares that angle to the angle that the car should be at, if it's on the correct road – that information is available in online geographic information systems.
If it's determined that the driver has entered the overpass in error, the app instantly alerts them to the fact. And even if they're supposed to be on it, the navigation system won't mistakenly think that they're still on the ground-level road that they actually exited.
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