US-6 AND ADAMS CENTRAL AVENUE The Nebraska Department of Transportation (NDOT) is in the early stages of analysis and design work to improve the intersection at U.S. Highway 6 (US-6) and Adams Central Avenue outside of Hastings. Project Purpose The purpose of this proposed project is to reduce the frequency and severity of crashes at the intersection of US-6 and Adams Central Avenue, improve the mobility of the traveling public, and improve the reliability of the transportation system. Project Need The project need is based on the history of crashes at this intersection, as well as to address the additional traffjc within the area since the completion of the new elementary school.
INTERSECTION CRASH HISTORY INTERSECTION CRASH TYPE DISTRIBUTION PERCENT OF CRASHES 50% STATE OF NEBRASKA (2017) 45% ADAMS CENTRAL (2007 - 2017) 40% 35% 30% 25% 20% 15% 10% 5% 0% SIDESWIPE OPPOSING INTERSECTION CRASH TYPE DISTRIBUTION NUMBER OF CRASHES 6 ADAMS CENTRAL (2007 - 2017) 5 4 3 2 1 0 E P G I W N I S S E O D P I P S O
INTERSECTION CRASH HISTORY CRASH SEVERITY BY LOCATION PERCENT OF CRASHES 100% PROPERTY DAMAGE ONLY 90% FATAL + INJURY 80% 70% 60% 50% 40% 30% 20% 10% 0% STATE OF ADAMS COUNTY ADAMS CENTRAL ADAMS CENTRAL NEBRASKA (2017) INTERSECTION INTERSECTION (2017) (2007 - 2017) (2012 - 2017) DRIVER AGE CRASH DISTRIBUTION PERCENT OF DRIVERS 50% STATE OF NEBRASKA (2017) 45% ADAMS CENTRAL (2007 - 2017) 40% 35% 30% 25% 20% 15% 10% 5% 0% 15 - 24 25 - 34 35 - 44 45 - 54 55 - 64 65 - 74 75 +
DAILY TURNING MOVEMENTS Number of vehicles turning in each direction throughout the day 35% 32% 24% 147 132 384 109 100 310 31% 152 116 325 437 34% 1% 1,093 1,081 1,126 1,081 -5% -4% 26 27 125 112 -10% TRAFFIC APRIL 2018 TRAFFIC AUGUST 2018 22 113 116 TRAFFIC GROWTH 35 139 107 59% 23% -8% S. Adams Central Ave. PEAK HOUR MOVEMENTS Number of vehicles turning in each direction from 7:15AM TO 8:15AM 91% 89% 500% 42 12 104 22 2 55 45% 64 44 124 181 46% -2% 258 262 113 89 -21% 0% 3 3 6 7 17% TRAFFIC APRIL 2018 8 51 25 TRAFFIC AUGUST 2018 3 52 16 TRAFFIC GROWTH -63% 2% -36% S. Adams Central Ave.
TRAFFIC SIGNAL WARRANTS Traffic signals can only be installed where necessary. The U.S. Department of Transportation developed a series of nine warrants to be used to determine if a traffic signal is needed. At least one warrant must be met before a signal can be installed. Installing a traffic signal where it is not needed can actually make an intersection less safe, which is why this review process is important. WARRANT 1 8 Hour Traffic Volume or Interruption of Continuous Flow Looks at whether or not there is currently excessive delays in traffic over 8 hours of an average day. WARRANT 2 4 Hour Vehicle Volumes Looks at whether or not there is currently excessive delays in traffic over 4 hours of an average day. WARRANT 3 Peak Hour Volume Looks at whether or not there is currently excessive delays in traffic around complexes that see large peaks in traffic such as stadiums and industrial complexes. WARRANT 4 Pedestrian Volumes Looks to see if large numbers of pedestrians are experiencing excessive delays. WARRANT 5 School Crossings Looks to see if large numbers of students are experiencing delays crossing a roadway while walking or biking. WARRANT 6 Coordinated Signal Systems Pertains to areas with a series of multiple signals at major intersections. WARRANT 7 Crash Experience Pertains to intersections with 5 or more crashes in a year (of types susceptible to correction by a traffic signal) and traffic volume thresholds. WARRANT 8 Roadway Network Pertains to areas coordinating and organizing traffic flow on an entire network. WARRANT 9 Intersection Near a Grade Crossing Pertains to areas near an at-grade railroad crossing.
TRAFFIC SIGNAL WARRANTS ANALYZED Warrants that applied to the US-6 & Adams Central Avenue intersection project were analyzed with the following results. WARRANT 1 EIGHT HOUR VEHICULAR VOLUME CONDITION A CONDITION B CONDITION A+B Condition Satisfied? NOT SATISFIED NOT SATISFIED NOT SATISFIED Required values reach for? 3 HRS 1 HR 3(A) + 2(B) Criteria - Major street (vehicles/hr) 350 525 280(A) + 420(B) Criteria - Minor street (vehicles/hr) 105 53 84(A) + 42(B) WARRANT 2 FOUR HOUR VEHICULAR VOLUME Condition Satisfied? NOT SATISFIED Required values reach for? 3 HRS Criteria SEE FIGURE WARRANT 2 THRESHOLD INTERSECTION VOLUMES MINOR STREET VOLUME (HIGH APPROACH ONLY) 1,000 900 800 700 600 500 400 300 200 100 0 500 1000 1500 MAJOR STREET VOLUME (TOTAL OF BOTH APPROACHES)
TRAFFIC SIGNAL WARRANTS ANALYZED Warrants that applied to the US-6 & Adams Central Avenue intersection project were analyzed with the following results. WARRANT 3 PEAK HOUR VEHICULAR VOLUME CONDITION A CONDITION B NOT SATISFIED NOT SATISFIED Condition Satisfied? Required values reach for? 0 HRS 0 Total, 0 minor, 0 delay Criteria - Total Approach Volume (vehicle-hours) 800 SEE FIGURE Criteria - Minor St High Side (vehicles/hr) 100 BELOW Criteria - Minor St High Side Delay (vehicles/hr) 4 W ARRANT 3 THRESHOLD INTERSECTION VOLUMES MINOR STREET VOLUME (HIGH APPROACH ONLY) 1,000 900 800 700 600 500 400 300 200 100 0 500 1000 1500 MAJOR STREET VOLUME (TOTAL OF BOTH APPROACHES) WARRANT 7 CRASH EXPERIENCE OF TYPES SUSCEPTIBLE BY A TRAFFIC SIGNAL NOT SATISFIED Condition Satisfied? 3 Correctable Reported Crashes in last 5 yrs Total Reported Crashes in last 5 yrs 16 5 crashes/ 1 yr Criteria
INTERSECTION IMPROVEMENT ALTERNATIVES NO LONGER UNDER CONSIDERATION The following alternatives were analyzed as potential improvements to the US-6 and Adams Central Avenue intersection, but have been dropped from consideration based on engineering analysis. 2-Way Stop Controlled with Traffic Calming - Also known as the “do nothing” approach, this was found to not meet the purpose and need of the project. 4-Way Stop Controlled - After analysis, it was determined a 4-way stop would not meet the purpose and need of the project. Traffic Signal - Signal warrants were not met, meaning a traffic signal is not appropriate for this intersection. Additional entrance to Elementary School - After analysis, it was determined that adding an entrance would not address the issues at the US-6 & Adams Central intersection.
INTERSECTION IMPROVEMENT ALTERNATIVES UNDER CONSIDERATION The following alternatives were analyzed as potential improvements to the US-6 and Adams Central Avenue intersection, and will continue to be explored as potential solutions. Offset Right Turn Lane Restricted Crossing U-Turn (RCUT) Roundabout
EVALUATION CRITERIA Following are the criteria that NDOT is using to evaluate the intersection improvement alternatives. TRAFFIC OPERATIONS Future Level of Service during peak hour, truck accommodations, traffic signal warrants SAFETY ANALYSIS NDOT past experience, younger driver behaviors using nationally documented research CONSTRUCTION COST Length of improvements, pavement, phasing (fuller ball means lower cost) ROW IMPACTS Area affected, number of properties SCHEDULE RISK Public concerns requiring additional study ALTERNATIVES OPERATIONS SAFETY COST ROW SCHEDULE OFFSET RIGHT TURN 1 1 4 3 3 RCUT 2 2 3 1 1 ROUNDABOUT 3 4 2 1 2
RESOURCES CONSIDERED Potential impacts to a variety of environmental resources will be evaluated during the study process. We welcome your input: Land Use Farmland Considerations Relating to Pedestrians and Bicycles Transportation Hazardous Materials and Wastes Construction Impacts Section 4(f) / Section 6(f) Wetlands and Waters of the US Water Quality and Pollution Prevention Permits Wildlife, Plants, and Fish Threatened or Endangered Species Recreation Indirect /Cumulative Effects
WHAT IS A CATEGORICAL EXCLUSION? The National Environmental Policy Act (NEPA) requires us to complete a Categorical Exclusion to document the impacts a transportation project may have on the human and natural environment. We will review Section 4(f) and 6(f); endangered species and their habitats; hazardous materials and wetlands. Through this process, we will coordinate and document public and agency input on the proposal, alternatives, impacts, and mitigation. In addition to the public, the US Army Corps of Engineers, US Fish and Wildlife Service, Native American Tribes, Nebraska Game & Park Commission, conservation groups, local governments, and many others will be engaged in the study process. STEPS TO DEVELOP A CATEGORICAL EXCLUSION DEFINE PURPOSE AND NEED 1 • Define the Study Area • Identify what concerns or deficiencies need to be addressed DEFINE REASONABLE ALTERNATIVES • Identify design criteria • Identify feasible intersection designs 2 • Modify alternatives to avoid or minimize impacts • Stakeholder Meeting ASSESS IMPACTS ON HUMAN & NATURAL ENVIRONMENT • Conduct studies • Coordinate with agencies 3 • Determine appropriate mitigation (if needed) • Determine alternatives advancing for detailed study • Public Meeting DEVELOP THE CE DOCUMENT • Identify the Preferred Alternative 4 • Summarize study findings • Publish document • Obtain NDOT and Cooperating Agency approvals
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