City of Phoenix, Arizona Collector Street Mitigation Program Street Transportation Department Safety & Neighborhood Traffic Section May 1, 2009 Presented by Jenny L. Grote, P.E., PTOE Co-authored by Kerry Wilcoxon, P.E.
Neighborhood Traffic Management Program Traffic Management Options: Local Streets Speed Hump Program Neighborhood Traffic Management Collector Streets Traffic Circle Pilot Program
Speed Humps Devices intended to slow traffic and discourage cut-through traffic Criteria for installation: LOCAL streets only (with City approval) Cost dependent on speed and volume Neighborhood-approved and funded
Neighborhood Traffic Management Program to install traffic deterrent devices on neighborhood streets Dependent on traffic speed and volume Primarily LOCAL streets Neighborhood-driven and approved
Traffic Circle Pilot Program City-driven program to install traffic circles on neighborhood collector streets Applies to COLLECTOR street intersections Small or no petition boundary City-funded
Neighborhood Traffic Management Program Traffic management problem: Mitigation on NEIGHBORHOOD COLLECTOR streets
Collector Street Mitigation Program Resident-driven program to install traffic circles, chicanes or curb extensions on neighborhood collector streets Devices intended to slow traffic Applies to COLLECTOR street intersections or segments Large petition boundary Funding from 2006 bond election for FY 2008+
Collector Street Mitigation Program Qualifications Intended for moderate volume neighborhood collector streets 2,000-10,000 vehicles per day, and/or Excessive speeding, and/or Proximity to school zone Low volume: < 2,000 vpd High volume: > 10,000 vpd } Limited or no funding through program
Collector Street Mitigation Program Traffic mitigation on collector streets Infrastructure Solutions: Horizontal Displacement Features Signing and Striping Changes Traffic Circles Chicanes
Collector Street Mitigation Program Procedures Designed around three phases (all require neighborhood involvement) PHASE I Initial Study PHASE II Temporary Installation PHASE III Permanent Installation
Collector Street Mitigation Program PHASE I: Initial Study Neighborhood Contact Initial traffic volume and speed study If qualifies - a Design Authorization Petition is developed
Collector Street Mitigation Program PHASE II: Temporary Installation Staff develops temporary traffic mitigation plan If plan is approved - City installs temporary plan Traffic patterns are studied
Collector Street Mitigation Program PHASE III: Permanent Installation Staff reviews results of temporary plan with residents Residents are petitioned for permanent installation City installs permanent structure
Collector Street Mitigation Program Case Study: Coral Gables and Indian Hills Collector-Local 3-way intersection
Temporary Installation Coral Gables and Indian Hills Traffic Studies: Volume before: 4,034 vpd after: 3,954 vpd 2% Speed (posted 30mph) before: 36 mph after: 36 mph
Outcome Temporary Installation Neighborhood upset about circle and complained to traffic committee Residents within 100% zone received bulk of complaints Key petition signatures redacted and circle was R E M O V E D
Collector Street Mitigation Program Case Study: Maryland Ave and 3 rd Street Collector-Local 4-way intersection
Traffic Studies: Volume Temporary Installation Maryland Ave and 3 rd Street before: 5,398 vpd after: 5,313 vpd 2% Speed (posted 35 mph) before: 35.6 mph after: 31 mph 13%
Outcome Temporary Installation Maryland Ave and 3 rd Street Support from corner properties Few complaints from residents or commuters No increase in traffic on by-pass routes No re-design needed Residents petitioning for permanent installation
Collector Street Mitigation Program Case Study: Flamenco and Country Gables Collector-Collector 4-way intersection
Temporary Installation Flamenco and Country Gables Traffic Studies: Volume before: 3,490 vpd after: 3,450 vpd 1% Speed (posted 30 mph) before: 26 mph after: 24 mph 8%
Outcome Temporary Installation Flamenco and Country Gables Marginal support from corner properties Many complaints from residents and commuters Re-design required for buses and fire trucks Residents undecided on whether to petition for permanent circle
Lessons Learned Neighborhood support is important BUT support of residents within 100 feet is vital Off-street residents typically do not support efforts of collector street mitigation Temporary installation phase: allows test of design and modifications allows residents to experience design saves time and money KEEP ELECTED OFFICIALS INFORMED
ITE Western District 2009 Annual Meeting Denver, Colorado July 12-15, 15, 2009