ADVANCED TRAFFIC MANAGEMENT SYSTEM · ADVANCED TRAFFIC MANAGEMENT SYSTEM. MERCER CORRIDOR. A vital...
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ADVANCED TRAFFIC MANAGEMENT SYSTEM MERCER CORRIDOR A vital corridor in the heart of a growing city. The Mercer Corridor in Seattle, Washington is a critical arterial thoroughfare that serves the City’s growing South Lake Union technology hub. It is home to Amazon, Google, Gates Foundation, Expedia and the University of Washington. Dubbed the “Mercer Mess” by the media, this corridor receives a significant amount of public and political attention as the challenges with this east-west corridor go back decades and are a symptom of the City’s colliding grids that don’t align. SCOOT ADAPTIVE SIGNAL CONTROL Responsive technology to tackle growing demand. The deployed ASC technology is the Split Cycle Offset Optimization Technique (SCOOT), developed by the Transport Research Laboratory in the UK. SCOOT relies on roadway equipment that detects vehicles in every lane at every intersection to measure traffic levels. TRAFFIC SIGNAL PERFORMANCE MEASURES Collecting and analyzing data to optimize performance. To assess the overall performance of SCOOT, vehicle data is being collected daily and is compared to historical averages when SCOOT was not operational. Reporting periods include morning and evening peak travel times (3 hours) in both the eastbound and westbound directions during the 5-day work week. These periods are when traffic volumes are at their highest. ternal PERFORMANCE MEASURES Weekly reports designed for public display to show impact to corridor travel times and user savings. SCOOT ARCHITECTURE SCOOT is the Split Cycle Offset Optimization Technique, an adaptive control system and algorithm which is a real-time adaptive central control system. SCOOT uses uses detectors (loops, video, magnetometer, etc.) close to the upstream intersection to measure and react to congestion, with data returning to the control computer every second in ¼ second bytes. The system architecture operates parallel to the existing central server. SCOOT, via its scheduler, turns on and off for the selected intersections. Once the traffic controller `sees’ the SCOOT commands over its communication channel, it responds. SCOOT controls are dropped after 3 seconds of no SCOOT commands. SCOOT OPERATIONS Ҙ SCOOT continually makes a calculation on every link in the network. Ҙ If the split (grey area) can be reduced then stops, delay and congestion will be reduced. If SCOOT has calculated that more traffic will benefit by extending the stage currently running then it will do so. Ҙ Green times are being recalculated at every phase change of every intersection continuously; offsets between intersections are recalculated one per cycle; cycle times are being recalculated every 2.5 or 5 minutes. PROJECT GOALS Seattle Department of Transportation’s (SDOT) mission is to deliver a high-quality transportation system for Seattle by connecting people, places, and products. This mission aligns with the goals Mercer Corridor Adaptive Signal Control Project: Ҙ Quicker, more reliable travel times through the network Ҙ Enhanced transit operations Ҙ Reduced overall emissions and fuel consumption Ҙ Effective management of traffic fluctuations due to special events PROJECT DESCRIPTION A strategic approach to traffic congestion. SDOT’s adaptive signal control platforms is one of the many strategies that the City has taken to mitigate the impacts of congestion in a growing central business district. They City has partnered with industry leaders in Intelligent Transportation Systems (ITS) technologies to implement a Center of Excellence (COE). The Center of Excellence is a living lab that integrates functionality of multiple Active Traffic Management System (ATMS) platforms to provide a data-driven approach to traffic management. SYSTEM DEPLOYMENT Controller Cabinet Upgrades Vehicle Detection Configuration Main User Interface Corridor Interface Intersection Interface Central Server System Installation and Operation DATA SOURCES Sensys Magnetometers Acyclica Travel Time Devices EDI iCITE Data Aggregator Internal PERFORMANCE MEASURES Weekly reports designed for use by traffic operations staff to identify areas of improvement and informing upper management. TRAVEL TIMES TRAVEL VOLUMES EASTBOUND WEEKDAY Minutes Time EASTBOUND Minutes WESTBOUND WEEKDAY Minutes Time WESTBOUND Minutes CROSS-STREET TRAVEL TIMES TRANSIT & STREETCAR TRAVEL TIMES NORTHBOUND Minutes Time STREETCAR SOUTHBOUND Minutes Time NORTHBOUND SOUTHBOUND TRANSIT (RAPIDRIDE D-LINE) NORTHBOUND SOUTHBOUND Minutes Minutes Minutes Minutes NB SB No SCOOT SCOOT No SCOOT SCOOT No SCOOT SCOOT Time Time No SCOOT SCOOT
Transcript of ADVANCED TRAFFIC MANAGEMENT SYSTEM · ADVANCED TRAFFIC MANAGEMENT SYSTEM. MERCER CORRIDOR. A vital...
ADVANCED TRAFFIC MANAGEMENT SYSTEM
MERCER CORRIDORA vital corridor in the heart of a growing city.The Mercer Corridor in Seattle, Washington is a critical arterial thoroughfare that serves the City’s growing South Lake Union technology hub.It is home to Amazon, Google, Gates Foundation, Expedia and the University of Washington. Dubbed the “Mercer Mess” by the media, this corridor receives a significant amount of public and political attention as the challenges with this east-west corridor go back decades and are a symptom of the City’s colliding grids that don’t align.
SCOOT ADAPTIVE SIGNAL CONTROLResponsive technology to tackle growing demand.The deployed ASC technology is the Split Cycle Offset Optimization Technique (SCOOT), developed by the Transport Research Laboratory in the UK. SCOOT relies on roadway equipment that detects vehicles in every lane at every intersection to measure traffic levels.
TRAFFIC SIGNAL PERFORMANCE MEASURESCollecting and analyzing data to optimize performance.To assess the overall performance of SCOOT, vehicle data is being collected daily and is compared to historical averages when SCOOT was not operational. Reporting periods include morning and evening peak travel times (3 hours) in both the eastbound and westbound directions during the 5-day work week. These periods are when traffic volumes are at their highest.
External PERFORMANCE MEASURESWeekly reports designed for public display to show impact to corridor travel times and user savings.
SCOOT ARCHITECTURESCOOT is the Split Cycle Offset Optimization Technique, an adaptive control system and algorithm which is a real-time adaptive central control system. SCOOT uses uses detectors (loops, video, magnetometer, etc.) close to the upstream intersection to measure and react to congestion, with data returning to the control computer every second in ¼ second bytes.The system architecture operates parallel to the existing central server. SCOOT, via its scheduler, turns on and off for the selected intersections. Once the traffic controller `sees’ the SCOOT commands over its communication channel, it responds. SCOOT controls are dropped after 3 seconds of no SCOOT commands.
SCOOT OPERATIONS
Ҙ SCOOT continually makes a calculation on every link in the network. Ҙ If the split (grey area) can be reduced then stops, delay and congestion will be reduced. If SCOOT has calculated that more traffic will benefit by extending the stage currently running then it will do so. Ҙ Green times are being recalculated at every phase change of every intersection continuously; offsets between intersections are recalculated one per cycle; cycle times are being recalculated every 2.5 or 5 minutes.
PROJECT GOALSSeattle Department of Transportation’s (SDOT) mission is to deliver a high-quality transportation system for Seattle by connecting people, places, and products. This mission aligns with the goals Mercer Corridor Adaptive Signal Control Project:
Ҙ Quicker, more reliable travel times through the network Ҙ Enhanced transit operations Ҙ Reduced overall emissions and fuel consumption Ҙ Effective management of traffic fluctuations due to special events
PROJECT DESCRIPTIONA strategic approach to traffic congestion.SDOT’s adaptive signal control platforms is one of the many strategies that the City has taken to mitigate the impacts of congestion in a growing central business district.They City has partnered with industry leaders in Intelligent Transportation Systems (ITS) technologies to implement a Center of Excellence (COE). The Center of Excellence is a living lab that integrates functionality of multiple Active Traffic Management System (ATMS) platforms to provide a data-driven approach to traffic management.
SYSTEM DEPLOYMENTController Cabinet Upgrades Vehicle Detection
Configuration
Main User Interface Corridor Interface Intersection Interface
Central Server System Installation and Operation
DATA SOURCESSensys Magnetometers
Acyclica Travel Time Devices
EDI iCITE Data Aggregator
Internal PERFORMANCE MEASURESWeekly reports designed for use by traffic operations staff to identify areas of improvement and informing upper management.
TRAV
EL T
IMES
TRAV
EL V
OLU
MES
EASTBOUND WEEKDAY
Min
utes
Time
EASTBOUND
Min
utes
WESTBOUND WEEKDAY
Min
utes
Time
WESTBOUND
Min
utes
CR
OSS
-STR
EET
TRAV
EL T
IMES
TRAN
SIT
& ST
REE
TCAR
TR
AVEL
TIM
ES
NORTHBOUND
Min
utes
Time
STREETCAR
SOUTHBOUND
Min
utes
Time
NORTHBOUND
SOUTHBOUND
TRANSIT (RAPIDRIDE D-LINE)
NORTHBOUND
SOUTHBOUND
MinutesMinutes
Minutes Minutes
NBSB
No SCOOT
SCOOT
No SCOOT
SCOOT
No SCOOT
SCOOTTime
TimeNo SCOOT
SCOOT
