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Maximizing ‘Bang for the Buck’ Through Engineering

This presentation discusses innovative communication design and traffic signal synchronization solutions implemented in San Bernardino, aimed at improving roadway network operational efficiency. With over 272,000 traffic signals in the USA, synchronization can significantly enhance traffic flow, reduce delays, and lower emissions. The San Bernardino project, linking 1,200 signals across 15 jurisdictions, utilizes wireless communication technology. This cost-effective solution optimizes existing roadway capacity, delivering maximum impact without the heavy costs of new infrastructure.

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Maximizing ‘Bang for the Buck’ Through Engineering

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  1. Innovative System Communication Design and Traffic Signal Synchronization Solutions for San Bernardino 2012 ITE District 6 Annual Conference Leo Lee, PE ADVANTEC Consulting Engineers & Philip Chu SANBAG June 27, 2012

  2. Maximizing ‘Bang for the Buck’ Through Engineering • Subject – Improving Operational Efficiency of our Roadway Network • The Process – Traffic Signal Synchronization • The Project – San Bernardino County Tier 3 and 4 Traffic Signal System

  3. The Issue • Currently there are more than 272,000 traffic signals in the USA • All need signal timing updates regularly • Los Angeles ranked no. 1 in America’s Most Congested Cities (source TTI): • over 70 hours annual delay per traveler; • 366,969 excess gallons of gas • Delay, speed, fuel consumption and air pollution can be improved by:- • Synchronizing Traffic Signals • Providing traffic signal systems for agencies to monitor traffic operations

  4. The Process • Synchronizing Traffic Signals • Allows maximum operational efficiency of existing roadways • Utilizes the existing roadway capacity most effectively • Reduces delay • Reduces stops • Improves speed • Reduces gas consumption • Reduces pollutant emissions • MORE COST EFFECTIVE THAN BUILDING NEW INFRASTRUCTURE!!

  5. The Project • San Bernardino Associated Governments (SANBAG) Comprehensive Traffic Signal System • More than 1,200 traffic signals • 15 jurisdictions, including Caltrans • 545 under Tiers 1 and 2 – completed in 2009 • 678 more in Tiers 3 and 4 currently under way

  6. Tier 3 and 4 ProjectSan Bernardino County Comprehensive Traffic Signal System Colton, San Bernardino City, Highland, Loma Linda, San Bernardino County Upland, Rancho Cucamonga, Ontario Fontana, Rialto Redlands, Yucaipa, Caltrans Chino & Chino Hills, Caltrans

  7. Tier 3 and 4 ProjectSan Bernardino County Comprehensive Traffic Signal System • Background • 15 agencies have different traffic signal systems • ‘Traditional’ signal interconnect are incomplete and expensive • Need to provide ‘cheap’ solution • Answer : WIRELESS COMMUNICATION

  8. Wireless Communication Options

  9. Summary of Technology • Serial-Radios • Conform to existing communications infrastructure • Low bandwidth • Low maintenance and operations costs • Serial Radio Example • Many Cities currently use serial radios, e.g. Encom

  10. Summary of Technology • IP-Radios • Ease of management and maintenance • High bandwidth (can support CCTV) • No polling rate issues • State-of-the-art technology • IP-Radio Example • Many IP-Radios have proven to be reliable, e.g. Alvarion, Proxim, Motorola.

  11. Summary of Technology • Cellular Radio Modems • For trunk communications between master radio and TMC • For remote locations • Serial / IP Platform • Several manufacturers support both platforms, e.g. Raven XT

  12. Ethernet versus Serial Communications • Ethernet Technologies • Tremendous technological progress in the past 10 years • Many cities migrating from serial towards Ethernet • Can achieve higher bandwidth (and speed) • Can transmit video over radio • Converting Serial to Ethernet • Need terminal servers at controllers • Need virtual communications ports at TMC, or • Upgrade traffic management systems software that supports Ethernet (e.g. QuicNet Pro, Centracs)

  13. Requirements for full migration towards Ethernet 1 Upgrade to QuicNet Pro maybe planned.

  14. Requirements for full migration towards Ethernet

  15. Topography Profile • Intersections and Paths Being Analyzed • See highlighted path shown above • Topography Profiles • Shown on the bottom half of the illustration • Used to determine any land elevation obstructions

  16. Wireless Communication Path Diagrams • Equipment required • The diagrams indicate the equipment needed for each intersection • Intended to be a generic design that can be adapted to each City’s equipment selection

  17. Project Cost • 250 intersections equipped with wireless comm. • 150 intersections with new controllers • 87 cellular modems • Hardware upgrade = $4M • Average cost = $16,000/intersection

  18. Questions??

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