Analysis of forward collision warning system based on vehicle-mounted sensors on roads with an up-down road gradient

Vehicle-mounted sensors have a limited detection range on a road with a gradient in relation to the vehicle infront. This study analyzes the performance on a road with a gradient of a forward collision warning system based on vehicle sensors. The level of warning given in relation to a vehicle infront is defined by the time-to-collision. Simulation results show that the forward collision warning system with vehicle-mounted sensors cannot function properly on a road with a gradient of over 9%. Furthermore, the limit ranges of the vehicle sensors were quantitatively analyzed.