Low Level Function
5.15.3.2 Analyse Road Situation around Host Vehicle

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to determine the probability of a collision between the Host Vehicle (i.e. the Vehicle in which it is operating) and another Vehicle.
(2) The ability to use data about the location of Other Vehicles in the vicinity of the Host Vehicle and the predicted immediate forward trajectory of the Host Vehicle to determine if there is a high possibility of collisions taking place between them.
(3) The ability to perform this determination every time that the trajectory of the Host Vehicle or the position of Other Vehicles changes.

Functional Requirements

(a) continuously monitor for receipt for either of the input data flows
(b) when either of the input data flows is received in (a), determine the probability of a collision between the Host Vehicle and Other Vehicles and/or Other Road Users nearby
(c) if the result of (b) is that a collision is probable then determine the corrective action that needs to be taken by the Driver of the Host Vehicle
(d) send the result of (c) together with a warning about a probably collision to the Provide Vehicle Trajectory Information to Driver function in the vehicle collision warning data flow
(e) if the result of (b) is that no collision will take place, send the location of other vehicles and road users nearby to the Provide Vehicle Trajectory Information to Driver function in the nearby vehicles and road user information data flow
(f) when the host vehicle is approaching a junction from a side road, the output data flow in (e) shall include advice on how and when the driver should move the vehicle into the main road
(g) whatever the result of (b), always send a message to the Output Commands & Information to Urban Roads function in the possible conflicts with vehicle movement data flow
(h) it shall be possible for several of the outputs identified in (d), (e) and (f) to be repeated as the vehicle moves through the same junction, or a succession of junctions in the road network and its situation changes relative to other vehicles, other road users, pedestrians and Vulnerable Road Users (VRU's).

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 5.15.3 Determine Host Vehicle Situation
  • Functional Tree of Area 5

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    7.4.6.11
    The system shall be able to warn the driver, via an in-vehicle device, that another equipped vehicle is approaching the host vehicle from the front and in the same (partial) lane.
    7.4.6.12
    The system shall be able to warn the driver, via an in-vehicle device, that another equipped vehicle is approaching the host vehicle from the rear in the same (partial) lane and, when possible, provide advice, e.g. change to a safe adjacent lane, accelerate.
    7.4.6.13
    The system shall be able to warn the driver, via an in-vehicle device, that a slower equipped vehicle is ahead of the host vehicle and in the same (partial) lane and, when possible, provide advice, e.g. change to a safe adjacent lane, decelerate, brake.
    7.4.6.14
    The system shall be able to warn the driver, via an in-vehicle device, that there is a stationary object ahead of the host vehicle and in the same (partial) lane and, when possible, provide advice, e.g. change to a safe adjacent lane, brake.
    7.4.6.16
    The system shall be able to calculate the current and future trajectories of each vehicle and VRU approaching the host vehicle at an urban intersection and assess the potential for collisions with the host vehicle.
    7.4.6.17
    The system shall be able to warn the driver of the host vehicle, via an in-vehicle device, of any collisions that could occur with other vehicles and/or VRU that are approaching an urban intersection.
    7.4.6.18
    The system shall be able to use a road-side device to warn drivers of any collisions that could occur with other vehicles and/or VRU that are approaching an urban intersection.
    7.4.6.19
    The system shall be able to calculate the trajectory of each vehicles and VRU approaching a T-junction, predict their future trajectories, assess potential conflicts and advise the driver on the minor road when to exit and join the main road.
    7.4.6.2
    The system shall be able to determine that there is a high probability of a collision between the host vehicle and another vehicle.
    7.4.6.22
    The system shall be able to advise a driver, via an in-vehicle device, how to approach a complex urban junction, e.g. speed required to go through green phase, imminent red phase warning, reduce speed to avoid queuing traffic, another vehicle or VRU, recommended lane choice.
    7.4.6.3
    The system shall be able to warn the driver approaching a junction, via an in-vehicle device, of other equipped vehicles approaching that junction.
    7.4.6.5
    The system shall be able to determine that the host vehicle is (about to) change lanes and warns the driver, via and in-vehicle device, if there are other equipped vehicles on potential collision path (e.g. motor-cycle in a blind spot).
    7.4.6.6
    The system shall be able to determine that the host vehicle is (about to) overtake, or turn across the road, and warns the driver, via and in-vehicle device, if there are other equipped vehicles on potential collision path (e.g. motor-cycle in a blind spot).
    7.4.6.9
    The system shall be able to compare the current trajectory of a vehicle with the road geometry and send a warning to the drivers of other vehicles that might be affected, via an in-vehicle device, that an oncoming vehicle lane departure into their lane is imminent.
    7.4.8.5
    The system shall enable the trajectory of an emergency vehicle to be predicted and compared with the trajectories of other vehicles in the vicinity, and to warn the drivers of those other vehicles with a potential conflict, via an in-vehicle device.