Overview

This Function shall be capable of providing the following facilities:

(1) The ability to provide outputs that advise or command Drivers and/or Cyclists to use particular lane(s), and/or to drive at or below particular speeds and/or to maintain a particular headway between following Vehicles.
(2) The ability to provide these outputs in response to commands from the Manage Urban Traffic Speeds and Headways Function.
(3) The ability to provide these outputs using mechanisms that do not include in-vehicle displays or any type, and as a supplement to the outputs provided by the Output Commands & Information to Urban Roads Function.
(4) The ability to send the data in these outputs to other functionality for output by In-vehicle displays.

Functional Requirements

(a) continuously monitor for the arrival of the urban speed and lane commands data flows, plus the display error and speed being exceeded data flows
(b) when either the urban speed limit l&s comments or urban lane comments data flows in (a) is received, output its contents to drivers and cyclists in the appropriate traffic indications data flow and to the Manage Vehicle Communication to Driver function in the urban speed commands data flow
(c) also send the urban l&s device status data flow to the Detect Urban Traffic Violations function
(d) if the urban speed being exceeded data flow is received in (a), output its contents including the identity of the vehicle to which the message applies in the vehicle above required urban speeds data flow.
(e) if for any reason the actions in (b) or (d) fail then send a device failed indication in the urban l&s device status data flow to the Detect Urban Traffic Violations function and in the urban traffic management l&s response data flow to the Implement Urban Traffic Commands function
(f) if either of the urban l&s display error or urban speed display error data flows is received, check their contents to see if a difference has been found
(g) if a difference has been found then again send a device failed indication in the urban l&s device status data flow to the Detect Urban Traffic Violations function and in the urban traffic management l&s response data flow to the Implement Urban Traffic Commands function.

Diagrams

Parent Higher Level Function

• 3.1.1.5 Provide Urban Traffic Management Facilities

Input logical dataflows

• mt_urban_lane_commands
• mt_urban_speed_limit_l&s_commands
• pshvs.mt_urban_l&s_display_error
• pshvs.mt_urban_speed_being_exceeded
• pshvs.mt_urban_speed_display_error

Output logical dataflows

• mt.pshvs_urban_speed_commands
• mt_urban_l&s_device_status
• mt_urban_traffic_management_l&s_response
• td-urban_traffic_indications
• td-vehicle_above_required_urban_speeds
• tt.c-urban_traffic_indications

User needs