Low Level Function
3.1.1.5.2 Provide Planned Urban Traffic Management

Overview

This Function shall be capable of providing the following facilities:

(1) The ability to enable urban traffic management strategies to be implemented automatically by a timed sequence.
(2) The ability for the sequence mechanism to permit the implementation to be by any combination of time of day, day of week, day of month, or day of year.
(3) The ability for new sequences to be received from the functionality that provides the Road Network Operator interface.
(4) The ability to respond to requests received from the functionality that provides the Road Network Operator interface with details of the sequences that are currently available for use.
(5) The ability to send requests for the implementation of traffic management strategies to the urban traffic management functionality.

Functional Requirements

(a) when the first trigger input data flow is received the command that it contains shall be checked
(b) if the result of (a) is that the current available sequences are to be changed, then this shall be implemented
(c) completion of (b) shall be confirmed using the first trigger output data flow
(d) if the result of (a) is that details of the current sequences are to be output, this shall be sent to the urban traffic control Function using the first trigger output data flow
(e) periodically, the sequences shall be scanned and the next one to be implemented for the current day and time shall be determined
(f) when the day and time determined in (e) arrives, the control strategy(ies) requested in the sequence shall be sent to the urban traffic control Function using the second trigger output data flow
(g) when the second trigger input data flow is received the data for the new or revised urban traffic management strategy shall be checked for format and consistency
(h) if the result of (g) is acceptable, the strategy shall be made available for selection when required
(i) if the result of (g) is not acceptable, then details shall be output using the first trigger output data flow
(j) the actions in (e) and (f) shall take priority over all other actions carried out by this Function.

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.
    7.1.3.6
    The system shall be able to implement planned control strategies for planned events (e.g. sport, cultural, etc.).
    7.1.3.7
    The system shall be able to support a database of all known (future) events.