Cross-cutting Issues

This paper updates an earlier paper presented to ITS America in 2000 that described a Caltrans Internet Protocol-based CCTV network being deployed in San Diego County, CA. In this paper, changes to the network architecture from ATM to Gigabit Ethernet technology and from MPEG-1 to H.261 video compression technology are described. The CCTV video distribution system has been considerably simplified in the new architecture and deployment experience has validated the technology selection.

National Engineerign Technology Corporation

California DOT (Caltrans)

Presented at the ITS America Annual Conference and Exposition, May 19-22, 2003 Minneapolis, Minnesota

The California Department of Transportation, Caltrans, District 11 has deployed a unique, first of its kind, video distribution system in the San Diego region. This system is a Metropolitan Area Network (MAN) using a fiber optic backbone employing Asynchronous Transfer Mode (ATM) technology. This system carries a diverse range of services such as Internet Protocol (IP) and traditional telephone technologies. Whereas the traditional CCTV video system uses point-to-point high bandwidth analog video with analog switch technology and FM multiplexing, the San Diego system utilizes an all-digital video technology centered on the use of network protocols. This network is characterized by several distinct uses of technology. These include its ability to route video using standard networking protocols and to provide additional services for command and control of the roadside video equipment. Network management and remote software configuration is accomplished though a stand-alone management system. The video system establishes video paths between field-deployed cameras and the Caltrans Transportation Management Center (TMC) through creative use of remote access software. Command and control are accomplished through innovative utilization of a distributed digital network with tie-ins to the legacy infrastructure. Compared to traditional methods of video transmission, the digital solution adds significant capacity, increases flexibility, and simplifies deployment. Planned future enhancements will provide further efficiencies and flexibilities.

Caltrans, District 11, Transportation Management Center

National Engineering Technology Corporation

Presented at the 10th ITS Annual Conference and Exposition, May 1-4, 2000 Boston, MA

The Connected Vehicle for Safety, Mobility and User Fee Project is an extensive demonstration project undertaken in parallel with other Connected Vehicle Programs.  MnDOT’s efforts include designing, building and testing three new software applications to be run on an existing in-vehicle aftermarket consumer device that combine safety and mobility applications from the Connected Vehicle world with a mileage-based user fee application from the road user pricing world.  As part of this project, an extensive review of commercial-off-the-shelf (COTS) navigation devices was conducted to determine the strengths and weaknesses of each platform for meeting the system requirements of the project.  This presentation will summarize the findings from that review and evaluation.

Author: Robert Zimmer, CSEP

Presented at the 18th World Congress on ITS, October 2011, Orlando, Florida

The Connected Vehicle for Safety, Mobility and User Fee Project is an extensive demonstration project undertaken in parallel with other Connected Vehicle Programs.  MnDOT’s efforts include designing, building and testing three new software applications to be run on an existing in-vehicle aftermarket consumer device that combine safety and mobility applications from the Connected Vehicle world with a mileage-based user fee application from the road user pricing world.  As part of this project, an extensive review of commercial-off-the-shelf (COTS) navigation devices was conducted to determine the strengths and weaknesses of each platform for meeting the system requirements of the project.  This presentation will summarize the findings from that review and evaluation.

Battelle

Presented at the 18th World Congress on ITS, October 2011, Orlando, Florida

During  the  last  decade,  in-vehicle  route  guidance  systems  have  known  a  significant  spread. These systems, apart from providing assistance to drivers, offer the chance to manage traffic in  such  a  way  that  allows  an  increase  in  road  network  capacity  and  therefore  a  decrease  in traffic congestion, without the high cost expansion of the road infrastructure. In this paper, we propose  the  application  of  the  basic  principles  of  the  Constrained  System  Optimal  model, used  to  solve  the  traffic  assignment  problem,  in  the  case  of  routing  a  single  vehicle.  In contrast to the User Optimal model that provides no traffic improvement  guarantees and the System Optimal model that is unrealistic, the Constrained System Optimal solution adopts the goal of reducing congestion and at the same time remaining fair for drivers when selecting a route.

University of Patras

Presented at the ITS America Annual Conference and Exposition,November 16-20, 2008, New York, New York