INDOT Variable Speed Limit Enforcement

Project Description: This project would install ITS equipment that would monitor vehicle speed and leveraging this information, INDOT Indianapolis TMC would post safer driving speed limits during adverse or congested conditions.

Project Status: Planned

Project Stakeholders:

Project Inventory:

Interconnect and Flow

Diagrams

Project Service Packages:

Project Information Flows:

Information Flow	Source Element	Destination Element	Status
request for enforcement	INDOT Indianapolis TMC	ISP Dispatch	Planned
roadway dynamic signage data	INDOT Indianapolis TMC	INDOT Variable Speed Limits Field Equipment	Planned
roadway dynamic signage status	INDOT Variable Speed Limits Field Equipment	INDOT Indianapolis TMC	Planned
speed monitoring control	INDOT Indianapolis TMC	INDOT Variable Speed Limits Field Equipment	Planned
speed monitoring information	INDOT Variable Speed Limits Field Equipment	INDOT Indianapolis TMC	Planned
variable speed limit control	INDOT Indianapolis TMC	INDOT Variable Speed Limits Field Equipment	Planned
variable speed limit status	INDOT Variable Speed Limits Field Equipment	INDOT Indianapolis TMC	Planned

Project Functional Requirements (Element - Functional Object):

INDOT Indianapolis TMC - TMC Basic Surveillance

1: The center shall monitor, analyze, and store traffic sensor data (speed, volume, occupancy) collected from field elements under remote control of the center.
4: The center shall distribute road network conditions data (raw or processed) based on collected and analyzed traffic sensor and surveillance data to other centers.

INDOT Indianapolis TMC - TMC Speed Warning

3: The center shall monitor reduced speed zone warning field equipment.

INDOT Indianapolis TMC - TMC Traffic Information Dissemination

1: The center shall remotely control dynamic messages signs for dissemination of traffic and other information to drivers.

INDOT Indianapolis TMC - TMC Variable Speed Limits

2: Based on the measured data, the center shall calculate and set suitable speed limits by lane.
4: The center shall monitor the operational status of the variable speed limit equipment, including fault reports.

INDOT Variable Speed Limits Field Equipment - Roadway Basic Surveillance

1: The field element shall collect, process, digitize, and send traffic sensor data (speed, volume, and occupancy) to the center for further analysis and storage, under center control.
2: The field element shall collect, process, and send traffic images to the center for further analysis and distribution.

INDOT Variable Speed Limits Field Equipment - Roadway Speed Monitoring and Warning

1: The field element shall include sensors to detect vehicle speeds, under traffic or maintenance center control.
5: The field element shall monitor notify an enforcement agency when a speed violation is detected.

INDOT Variable Speed Limits Field Equipment - Roadway Traffic Information Dissemination

1: The field element shall include dynamic message signs for dissemination of traffic and other information to drivers, under center control; the DMS may be either those that display variable text messages, or those that have fixed format display(s) (e.g. vehicle restrictions, or lane open/close).

INDOT Variable Speed Limits Field Equipment - Roadway Variable Speed Limits

1: The field element shall monitor traffic and environmental conditions along the roadway.
3: The field element shall receive commands from the controlling center that establish speed limits by lane.
4: The field element shall display the current speed limits per lane to drivers.

ISP Dispatch - Emergency Dispatch

2: The center shall store the current status of all emergency vehicles available for dispatch and those that have been dispatched.

Traffic Data Archive - Archive Data Repository

10: The center shall respond to requests from the administrator interface function to manage the archive data.
11: The center shall respond to requests for archive data from archive data users (centers, field devices).
3: The center shall store collected data in an information repository.
7: The center shall provide the capability to execute methods on the incoming data such as cleansing, summarizations, aggregations, or transformations applied to the data before it is stored in the archive.

Standards:

Project Operational Concepts:

Roles and Responsibilities

Indiana Department of Transportation

Monitor freeway system
Monitor traffic images and traffic flow data through CCTVs and field sensors, and maintain operational control of its own field equipment.

Regional Objectives from the Metropolitan Plan:

2. To implement strategies that address congested segments.
2A. Develop mobility strategies that address system performance and congested transportation segments.

Last Updated: 2/7/2024