traffic signal re-timing studies to reduce congestion and emissions
DESCRIPTION
Presented by: Einah Reza PelaezTRANSCRIPT
Traffic Signal Retiming Studies to Reduce Congestion and Emissions
Einah PelaezTraffic Engineer/Associate
November 9, 2012
Outline
What is signal retiming?Benefits of signal retimingHow is signal retiming conducted?
Westchester County Department of Public Works (WCDPW) Signal Retiming Project
What is signal retiming?
Signal retiming is a process thatoptimizes the operation of signalized intersections through a
variety of low cost improvements.
Benefits of Signal Retiming
Improve Traffic Operating Conditions
Reduce EmissionsImprove Air QualityCost BenefitsImprove Safety
How is signal retiming conducted?
Inventory of existing signal system is conducted.
Traffic and pedestrian volume data are collected.
A crash history and analysis are prepared.
Capacity analysis is performed and calibrated.
Signal coordination and optimization Travel time and delay runs New timing is implemented
Westchester County Signal Retiming Project
• Over 600 signalized intersections• 28 Municipalities
Westchester County Department of Public Works
Westchester County Department of Public Works
Traffic, Roadway and Signal Data Collection
Analysis
Level 1: existing conditions
Level 2: timing, phasing and coordination improvements within the capabilities of existing signal equipment
Level 3: timing, phasing and coordination improvements with traffic signal equipment upgrades
Traffic AnalysisSynchro/Simtraffic
Reports
User Delay Cost Savings
Westchester Signal Timing Study User Delay Costs Summary Table - Level 2 over Existing
Municipality Mainline Side Total
Street
Arsdley, Briarcliff Manor, Buchanan, Cortlandt, Croton-on-Hudson, Dobbs Ferry
Greenburgh, Hastings-on-Hudson, Mt. Kisco, Mt. Pleasant, Mt. Vernon, Ossining $28,165,665 $ 4,376,805 $ 32,542,470
Peekskill, Pleasantville, Sleepy Hollow, Tarrytown, White Plains, Yorktown
Bronxville, Eastchester, Harrison, Larchmont, Mamaroneck Village,
Mamaroneck Town, New Rochelle, Pelham, Pelham Manor, Port $59,903,100 $15,878,000 $ 75,781,100
Chester, Rye, Rye Brook, Scarsdale, Tuckahoe, Yonkers
Total PINs 8110.29 & 8110.47 $88,068,765 $20,254,805 $108,323,570
User Delay Cost Savings based on a NYMTC developed a value of time estimate for User Delay based on a congestion management program. NYMTC estimates User Delay Cost at $23/hour as an average for the Westchester County area, and this reflects an overall average percentage of cars, trucks and buses in the area.
108,323,570
75,781,100
How was the study utilized?
Results and reports were presented to each municipality.
Encouraged municipalities to apply for CMAQ funding to improve the traffic signals.
Assisted municipalities in applying for the funding.
Municipalities were awarded.Signal timings were implemented (Level 2)Signal upgrades (Level 3) were implemented
in some locations and others are under construction.
Questions?