1. Public Information Meeting NW 100th Street Reconstruction Project
March 11, 2014

2. Introduction Thank You for Attending!
City of Johnston and HR Green Staff
Dave Cubit: Public Works Director
Emily Price: Communications Director
Chad Mason: Project Manager
Mike Lyons: Project Engineer
Cory Shannon: Staff Engineer
Ross Harris: Transportation Planner
Format of Meeting
Sign-In Sheet and Comment Forms
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3. Meeting Agenda Project Purpose and Need Conceptual Design Overview
Roundabout rationale
Funding
Schedule
Questions? (Open House)
Mark

4. Project Purpose and Need
Facility Type: NW 100th Street is currently a “rural section” roadway
24 ft. pavement width
Composite pavement, minimal shoulder
Open ditch drainage
Inappropriate section for proposed development.
Need:
“Urban Section” roadway with curbs, concrete paving, storm sewers and off-street pedestrian/bicycle accommodation
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5. Project Purpose and Need
Traffic Capacity: Traffic Impact Study (TIS) completed in 2012, with revisions in 2013
Traffic generated by new Johnston High School (opening 2016 – full build 2020)
Comprehensive Plan growth & development, Year 2037 (25-year horizon)
Existing roadway is deficient.
Need:
Intersection Control (signals or roundabouts)
Closely spaced intersections
Predominance of left turns
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6. Proposed Design Concept

7. Why Roundabouts?
Motorist Safety
Pedestrian Safety
Traffic Flow

8. Motorist Safety

9. Pedestrian Safety

10. Safety Comparison Insurance Institute of Highway Safety (www.iihs.org)
90 percent reduction in fatal crashes
75 percent reduction in injury crashes
30 percent reduction in pedestrian crashes
10 percent reduction in bicycle crashes

11. Traffic Flow #1 priority of Johnston citizens in recent survey
Federal Highway Administration (FHWA) studies found that roundabouts improve traffic flow by 30-50% compared to a conventional intersection.

12. Before & After

13. Funding $4.3 million project cost (City estimate)
Funded by General Obligation bond; cost-share between City and School District
No Special Assessments
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14. Surveying, mapping, data collection
Conceptual Design
Preliminary Plans
Easements & ROW
Final Plans
Bid Letting
Utility Relocation
Construction
Nov.- Dec. 2013
Jan.- Feb. 2014
Mar. – May 2014
Jun. - Oct. 2014
November 2014
Dec. – Mar. 2014/2015
Begin April 2015
Schedule
YOU ARE HERE

15. Questions?
Continue with Open House…