Low Level Function
3.1.1.5.19 Manage Urban Road Network Lanes

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to provide management of the lanes on roads in the urban network.
(2) The ability to enable the management of the lanes so that the most efficient use can be made of the road space available in the urban road network.
(3) The ability to enable the use of lanes to be changed in a way that is safe for vehicle operation and that causes the minimum disruption to all forms of urban road traffic.
(4) The ability to send commands that alter the use of lanes to the functionality that is responsible for the output of messages to Drivers, both at the roadside and in the Vehicle.

Functional Requirements

(a) when either the first or second trigger input data flows is received, the commands shall be produced to change the use of the lanes as requested
(b) the commands in (a) shall make the change of lane use in an orderly way such that the safety of vehicle and travellers is not reduced or compromised
(c) the commands in (a) and (b) shall be sent to the urban output actuation Function using the first trigger output data flow
(d) implementation of the first trigger input data flow in (b) and (c) shall take priority over the second trigger input data flow
(e) the new use of the lanes implemented in (c) shall also be sent to the Detect Urban Violation Function using the second trigger output data flow.

Diagrams

The Diagram(s) is (are) the diagram(s) where you can find the function :
  • DFD 3.1.1.5 Provide Urban Traffic Management Faciliti
  • Functional tree 3.1

    • Parent Higher Level Function

    Input logical dataflows

    Output logical dataflows

    User needs

    Number

    Description

    7.1.0.10
    The system shall be able to manage traffic in all or part of the road network using a methodology that is appropriate for urban roads, e.g. using traffic lights at junctions and with the possibility of incorporating facilities for pedestrians to cross the road in a controlled manner.
    7.1.10.1
    The system shall be able to reserve certain traffic lanes exclusively to specific classes of vehicles (e.g. high occupancy vehicles, or buses) and to detect violators.
    7.1.4.3
    The system shall provide Tidal Flow Control (reservation of lanes for exclusive use in one direction for a period, then the other direction for another period, on parts of the road network).
    7.1.5.2
    The system shall be able to command drivers to change lanes on multi-lane roads.
    7.1.5.3
    The system shall be able to change the direction of traffic flow on a some or all of the lanes on a carriageway in an orderly manner so that it does not create a safety hazard to any road user.
    7.1.5.4
    The system shall be able to reverse the direction of traffic flow along roads in the urban road network with a single direction of flow in an orderly manner so that it does not create a safety hazard to any road user.
    7.4.3.1
    The system shall be able to provide lane usage information to the driver via an in-vehicle display.
    7.4.3.3
    The system shall be able to provide instructions not to change lanes to the driver via an in-vehicle device in order to stabilise the total traffic flow.  These instructions may either apply to all types of vehicle, or to sub-sets.
    7.4.3.7
    The system shall be able to advise a driver, via an in-vehicle device, which lane to use when passing an incident/accident.
    7.4.3.8
    The system shall be able to advise a driver, via an in-vehicle device, where to stop safely (e.g. an appropriate exit lane, hard shoulder).
    7.4.8.7
    The system shall be able to advise the driver, via an in-vehicle device, of an appropriate lane to use to create a “blue corridor”.
    7.4.8.9
    The system shall enable the driver of the host vehicle to be advised, via an in-vehicle device, not to enter a zone defined by virtual cones.