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Article
Reconstructing a Six-Leg Intersection into Mohave County’s First Roundabout
Author(s)
Steven P. Latoski
Full-Text PDF XML 530 Views
DOI:10.17265/2328-2142/2018.02.001
Affiliation(s)
Mohave County Public Works, P.O. Box 7000, Kingman, Arizona 86402-7000, USA
ABSTRACT
Mohave County, Arizona maintains a six-leg intersection in the Golden
Shores area bisected by an uncontrolled regional County highway, County Route
1, where two STOP-controlled section line local roads converge. The two-lane,
rural CR 1 serves commuter and visitor traffic traveling between population
centers of Lake Havasu City, AZ and Bullhead City, AZ/Laughlin, NV on the
Colorado River and its desert lakes. The intersection features 180 total
vehicle-to-vehicle conflict points inclusive of 126 crossing conflicts. This paper presents
the County’s technical and administrative approach and techniques in planning
and developing the CR 1 “Six Points” roundabout given the (1) absence of fatal
and incapacitating injury crash history and (2) backdrop of this improvement
representing the County’s first roundabout. Project initiation entailed the
County securing a Federal share of Highway Safety Improvement Program funding
at 100-percent. Project design commenced with a preliminary engineering study
to identify, evaluate, and solicit public input on alternative improvement
solutions as part of validating the roundabout improvement as superior for
traffic operations, community and business function, sitting, and
constructability. Public input targeted preference for maintaining CR 1
uninterrupted flow versus interrupted flow introduced under roundabout
circulation. This simple decision tree enabled the County to understand
existing operational and access conditions important to the public, business
owners, and public safety providers for purpose of configuring a roundabout
improvement satisfying local motorist and community needs, which stoked
stakeholder buy-in on the project.
KEYWORDS
Roundabout, thru-about, safety, skewed intersections, predictive modeling, benefit-cost.
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