Physical Object: ITS Roadway Equipment

Roadway Speed Monitoring and Warning

Overview
Requirements
Information Flows
Standards

Overview

'Roadway Speed Monitoring and Warning' includes the field elements that monitor vehicle speeds. If the speed is determined to be excessive, an advisory or warning is displayed. Current environmental conditions and other factors that may reduce safe operating speeds may also be taken into account. The operational status (state of the device, configuration, and fault data) is provided to the center. This application can also provide an enforcement function, reporting speed violations to an enforcement agency.

This functional object is included in the "ITS Roadway Equipment" physical object.

This functional object is included in the following service packages:

This functional object is mapped to the following Functional View PSpecs:

Requirements

#	Requirement
01	The field element shall include sensors to detect vehicle speeds, under traffic or maintenance center control.
02	The field element shall include sensors to detect vehicle speeds, under enforcement agency control.
03	If the speed detected by vehicle speed sensors is determined to be excessive, the field element shall provide a safe speed advisory to passing drivers via a driver information system (such as portable messages signs, field to vehicle communications to in-vehicle signing systems, etc.).
04	The field element shall base speed advisories to passing drivers on environmental conditions.
05	The field element shall monitor notify an enforcement agency when a speed violation is detected.
06	The field element shall return operational status for the vehicle speed sensors to the controlling traffic or maintenance center; including measured speeds, warning messages displayed, and violation records.
07	The field element shall return operational status for the vehicle speed sensors to the enforcement agency.
08	The field element shall return fault data for the vehicle speed sensors to the controlling center for repair.

Information Flows

Source	Flow	Destination
Enforcement Center	automated enforcement parameters	ITS Roadway Equipment
Enforcement Center	speed monitoring control	ITS Roadway Equipment
ITS Roadway Equipment	reduced speed warning info	Connected Vehicle Roadside Equipment
ITS Roadway Equipment	vehicle signage local data	Connected Vehicle Roadside Equipment
ITS Roadway Equipment	driver information	Driver
ITS Roadway Equipment	speed monitoring information	Enforcement Center
ITS Roadway Equipment	violation notification	Enforcement Center
ITS Roadway Equipment	roadway dynamic signage status	Maint and Constr Management Center
ITS Roadway Equipment	speed monitoring information	Maint and Constr Management Center
ITS Roadway Equipment	roadway dynamic signage status	Traffic Management Center
ITS Roadway Equipment	speed monitoring information	Traffic Management Center
Maint and Constr Management Center	roadway dynamic signage data	ITS Roadway Equipment
Maint and Constr Management Center	speed monitoring control	ITS Roadway Equipment
Traffic Management Center	roadway dynamic signage data	ITS Roadway Equipment
Traffic Management Center	speed monitoring control	ITS Roadway Equipment
Vehicles	vehicle characteristics	ITS Roadway Equipment

Standards

The following table lists the standards associated with the functional object itself (as opposed to standards associated with an interface).

Name	Title
NEMA TS4 Hardware Standards for DMS	Hardware Standards for Dynamic Message Signs (DMS) With NTCIP Requirements