CC - Agendas - City Council - REGULAR - 8/29/2006

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Prescott City Council Regular Voting Meeting —August 8, 2006 Page 4 Median Islands • Eliminates some • Restricts access in cross streets conflicting movements • Impacts operation of existing to restrict • Restricts access signalized intersections access to right in/right out • Refuge for left turning • Requires advanced maneuvering vehicles • Creates speed differential2 Two Way left • Reduces the • Can introduce other types of turn lane necessary intersection collisions sight distance Left • Mitigates left • May increase other type of Turn/Angle Traffic Signals turn/angle collisions collisions • Mitigates left • Unable to redirect errant vehicles turn/angle collisions • Does not mitigate median Curbed Median • Restricts access crossover collisions • Drainage improvements necessary • High implementation cost • Restricts access • Vaulting may occur Reduction in • Lowers speed • Creates speed differential2 Speed Limits • Promotes weaving All • Introduces other collision types Photo Radar • Enforces posted • Does not mitigate reckless driving speed With the information listed above it has been determined that a concrete 32 inch F- shaped barrier in the center of the existing median would be the preferred mitigation for the median crossover and angle/left turn collisions. This barrier would be installed within the study limits with one opening. This opening would be signalized when signals warrants3 were met. Once comments are gathered on the study, ADOT is prepared to begin final design and would expect construction to begin soon after the completion of the design. ' End Treatments—A protective device placed at the end of barriers to mitigate damage in the event of a collision `. Speed Differential—The difference in speed between faster and slower moving traffic. ' Signal Warrants—8 warrants or tests that one or more must be met to justify the installation of a traffic signal. Councilman Bell asked how long it would take for Federal Highway approval and he was pleased to see a recommendation. Mr. Hammit responded approval would take approximately one week; the report would be reviewed and the review process was done locally. Mr. Hammit added the estimate was $2.4 million for two miles and if a traffic signal was warranted it could be funded through a State-wide Signal Fund or Hazard Fund; but a signal didn't mitigate accidents. Councilman Bell asked how long it would take for the design and Mr. Hammit replied that the design would be done fairly quickly and the project completed within the fiscal year, possibly next summer.