Overview

This Function shall be capable of providing the following facilities:

(1) The detection of Vehicles approaching a part of the urban road network (zone or "sensitive area"), to which access is controlled.
(2) The collection of the identity and a physical image of the Vehicle from sensors within the Function.
(3) The ability to check the detected Vehicle identity with a list of permitted Vehicles that it has been given by the Provide Urban Traffic Commands Function, as part of the traffic management strategy being currently implemented.
(4) The output of a warning message of no entry permission for display to Drivers of detected Vehicles whose identities do not match those on the permitted list.
(5) The output of data about the detected Vehicle to the Manage Vehicle Access to Sensitive Areas Function.

Functional Requirements

(a) continuously monitor for the arrival of the vehicle list data flow and when it arrives, up date the internal list with the information that it contains
(b) continuously monitor for the arrival of the vehicle approaching data flow
(b) when the data flow in (b) is received continuously monitor for the arrival of the vehicle image data flow
(c) when the data flow in (c) arrives, determine the vehicle identity from the image and check it against the list provided in (a)
(d) if no match is found, send a warning to the driver in the approaching urban zone data flow and send the vehicle identity data flow to the Prevent Access function
(e) if a match is found, send an advisory message to the driver in the approaching urban zone data flow and data about the vehicle to the Manage Data about Vehicle use of Sensitive Areas function in the vehicle nearing urban sensitive area data flow.

Diagrams

Parent Higher Level Function

• 3.1.1.5 Provide Urban Traffic Management Facilities

Input logical dataflows

• ftrfc-vehicle_approaching_urban_zone
• fv-identity_for_urban_zone_access
• mt_urban_zone_access_vehicle_list

Output logical dataflows

• mt.pscs_vehicle_nearing_urban_sensitive_area
• mt_urban_zone_vehicle_identity
• td-approaching_urban_zone

User needs