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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. Maximizing ‘Bang for the Buck’ Through Engineering. - PowerPoint PPT Presentation
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Innovative System Communication Design and
Traffic Signal Synchronization Solutions for San Bernardino
2012 ITE District 6 Annual Conference
Leo Lee, PEADVANTEC Consulting Engineers
&
Philip ChuSANBAG
June 27, 2012
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
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
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!!
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
Tier 3 and 4 ProjectSan Bernardino County Comprehensive Traffic Signal System
Chino & Chino Hills,Caltrans
Upland, Rancho Cucamonga,
Ontario
Fontana, Rialto
Colton, San Bernardino City,
Highland,Loma Linda,
San Bernardino County
Redlands,Yucaipa,Caltrans
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
Wireless Communication Options
Technology Frequency Band Range Data Rates Advantages Disadvantages Estimated Cost
Spread Spectrum Serial
902-928 MHz, 2400-2483.5 MHz, 5725-5850 MHz
2 miles Up to 256 Kbps
Available from multiple vendors
Requires line of sight, serial interface, limited bandwidth for future use
$2,000 Base + $2,000 Each additional intersection
Spread Spectrum Ethernet
5-7 miles Up to 1 Gbps
Higher bandwidth for future expansion, available from multiple vendors, ease of installation and operation
Requires line of sight, susceptible to interference
$2,000 Base + $ 400 Each additional intersection
Wi-Fi 300 feet 1-11 Mbps by distance
Increased security vs Wireless Ethernet
Short range
$1,100 Base + $ 580 Each additional intersection
WiMAX 6 miles 40 Mbps
Larger coverage, more users, scalable quality of service, faster data rates than WiFi
Equipment is more expensive up front
$2,800 Base + $ 500 Each additional intersection
Mesh Network 3 miles per link
54 Mbps Self healing, lower power consumption, increased data rates
Need more access points
$2,700 Base + $2,700 Each additional intersection
VHF (Very High Frequency) / UHF (Ultra High Frequency
VHF 30 MHz-300 MHz UHF 300 MHz-3 GHz
hundreds of miles
10 Kbps No interference
Licensed frequencies and equipment needs to be higher to provide adequate coverage. Equipment is expensive.
$8,000 Base + $6,000 Each additional intersection
Cellular Radio 824 - 896 MHz & 1850-1990 MHz
20 miles 9.6 Kbps Ease of installation and integration
Reoccurring leased service costs
$450 Base + $20-$35 Monthly fee
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
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.
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
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)
Requirements for full migration towards Ethernet
Agency ControllersTraffic Signal
System
Communications
Supported
Requirements for migrating towards Ethernet?
Colton 170 QuicNet1 Serial If upgraded to QuicNet Pro, and need to upgrade to 170ATC or 2070 controllers
Highland 170/2070 QuicNet Pro Serial/Ethernet Need to upgrade to 170ATC or 2070 controllers
Loma Linda 170 QuicNet1 Serial If upgraded to QuicNet Pro, and need to upgrade to 170ATC or 2070 controllers
Ontario ASC/2/8000/KMC-8000, Traconex
Icons/Aries Serial Need to migrate to Centracs or i2, and replace controllers with ASC/3 or 2070
Redlands Naztec 900/Eagle 2070/170 N/A N/A Need to implement a traffic signal system that is IP based, and upgrade controllers to 2070
Rialto 170ATC, ASC/2/2S/3/8000, Traconex , Synchronex
Aries/QuicNet1 Serial/Serial If upgraded to QuicNet Pro, and need to upgrade to 170ATC or 2070 controllers
San Bernardino 170/2070 QuicNet1 Serial If upgraded to QuicNet Pro, and need to upgrade to 170ATC or 2070 controllers
San Bernardino Co.
ASC/2/2M/2S/3. Eagle EPAC M52, Traconex
Aries/QuicNet1 Serial/serial If upgraded to QuicNet Pro, and need to upgrade to 170ATC or 2070 controllers
Upland 170/2070 QuicNet Pro Serial/Ethernet If upgraded to QuicNet Pro, and need to upgrade to 170ATC or 2070 controllers
Yucaipa 170/2070 N/A N/A Need to implement a traffic signal system that is IP based, and upgrade controllers to 2070
1 Upgrade to QuicNet Pro maybe planned.
Requirements for full migration towards Ethernet
Agency ControllersTraffic Signal System
Communications
Supported
Requirements for migrating towards Ethernet?
Caltrans 170 CTNet Serial Caltrans need to develop Ethernet capabilities within CTNet
Chino ASC/2/3S/8000 Aries Serial Need to upgrade to Centracs (or other systems), and replace controllers with ASC/3
Chino Hills ASC/2/2S/8000 Aries Serial Need to upgrade to Centracs (or other systems), and replace controllers with ASC/3
Fontana ASC/2/2S/3/8000 Aries Serial Need to upgrade to Centracs (or other systems), and replace controllers with ASC/3
Rancho Cucamonga
170/170E/ASC/3/2/2M/2S/8000, CSC
T-1, Traconex
Aries Serial Need to upgrade to Centracs (or other systems), and replace controllers with ASC/3
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
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
Project Cost
• 250 intersections equipped with wireless comm.
• 150 intersections with new controllers
• 87 cellular modems
• Hardware upgrade = $4M
• Average cost = $16,000/intersection
Questions??