I-95 Variable Speed Limits (complete)

Project Description: The I–95 Variable Speed Limits (VSL) is a pilot project to implement VSL on the northbound lanes of I–95 between mile markers 115 and 130 in Caroline and Spotsylvania counties, and the City of Fredericksburg. This area is characterized by day–to–day speed variability and high crash rates. The project objective is to reduce speed variability, improve throughput, and reduce crashes through the use of VSL that is responsive to real–time traffic conditions.

Project Status: Planned

Project Stakeholders:

• National Oceanic and Atmospheric Administration (NOAA)
• Private Sector ISPs
• VDOT Fredericksburg District
• VDOT NOVA Operations
• Virginia State Police

Project Service Packages:

• SU03: Data Distribution (VDOT Fredericksburg District VSL Project)
• TM20: Variable Speed Limits (VDOT Fredericksburg District VSL Project)
• WX01: Weather Data Collection (VDOT Fredericksburg District VSL Project)

Project Information Flows:

Information Flow	Source Element	Destination Element	Status
data provision	VDOT NOVA District MPSTOC - TOC/ATMS	VDOT Fredericksburg District VSL Data Lake	Existing
data publication	VDOT Fredericksburg District VSL Data Lake	Private Sector ISP Centers	Existing
data publication	VDOT Fredericksburg District VSL Data Lake	VDOT NOVA District MPSTOC - TOC/ATMS	Existing
data publication	VDOT Fredericksburg District VSL Data Lake	VSP Center - MPSTOC	Existing
data query	Private Sector ISP Centers	VDOT Fredericksburg District VSL Data Lake	Existing
data query	VDOT NOVA District MPSTOC - TOC/ATMS	VDOT Fredericksburg District VSL Data Lake	Existing
data query	VSP Center - MPSTOC	VDOT Fredericksburg District VSL Data Lake	Existing
data query publication	VDOT Fredericksburg District VSL Data Lake	Private Sector ISP Centers	Existing
data query publication	VDOT Fredericksburg District VSL Data Lake	VDOT NOVA District MPSTOC - TOC/ATMS	Existing
data query publication	VDOT Fredericksburg District VSL Data Lake	VSP Center - MPSTOC	Existing
data subscription	Private Sector ISP Centers	VDOT Fredericksburg District VSL Data Lake	Existing
data subscription	VDOT NOVA District MPSTOC - TOC/ATMS	VDOT Fredericksburg District VSL Data Lake	Existing
data subscription	VSP Center - MPSTOC	VDOT Fredericksburg District VSL Data Lake	Existing
environmental conditions data status	National Weather Service	VDOT NOVA District MPSTOC - TOC/ATMS	Existing
qualified environmental conditions data	National Weather Service	VDOT NOVA District MPSTOC - TOC/ATMS	Existing
variable speed limit control	VDOT NOVA District MPSTOC - TOC/ATMS	VDOT Fredericksburg District VSL Signs	Existing
variable speed limit control	VDOT NOVA District MPSTOC - TOC/ATMS	VDOT Fredericksburg District VSL Static Signs	Existing
variable speed limit status	VDOT Fredericksburg District VSL Signs	VDOT NOVA District MPSTOC - TOC/ATMS	Existing
variable speed limit status	VDOT Fredericksburg District VSL Static Signs	VDOT NOVA District MPSTOC - TOC/ATMS	Existing

Project Functional Requirements (Element - Functional Object):

• No functional requirements.

Standards:

• US: NTCIP Message Sign - SNMPv3/TLS

Project Operational Concepts:

Roles and Responsibilities

• Virginia State Police
• Collect variable speed limit conditions for VSP operations purposes.


• Private Sector ISPs
• Collect variable speed limit conditions for dissemination to travelers.


• VDOT NOVA Operations
• Collect Weather information from various sources (subscription weather services, national weather service, FEMA etc)
• Collects current road and weather conditions using data collected from environmental sensors deployed on or about the roadway.
• Communicate variable speed limits through Fredericksburg District VSL roadside equipment.


• National Oceanic and Atmospheric Administration (NOAA)
• Provide weather conditions for transportation operations.


• VDOT Fredericksburg District
• Operate and maintain variable speed limit equipment and data lake.
• Post variable speed limit data to dynamic and static signs.