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Baseline Traffic Study
 

Baseline Traffic Study

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A presentation on the Baseline Traffic Studies associated with the Rosemont Copper Project developed by the Tetra Tech. This presentation was given to the Forest Service and their contractors during ...

A presentation on the Baseline Traffic Studies associated with the Rosemont Copper Project developed by the Tetra Tech. This presentation was given to the Forest Service and their contractors during technical transfer meetings in November 2008.

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    Baseline Traffic Study Baseline Traffic Study Presentation Transcript

    • Traffic StudyFor the Rosemont Copper ProjectBy Kekoa Anderson, P.E.,David Bost &Seri Park, Ph.D.
    • Presentation Agenda § Traffic Study Elements • Traffic Analysis • Study Site • Traffic Data § Level of Service Analysis • Simulations § Roadway Assessment • Safety Analysis • Geometric Analysis § Findings § Q&A Traffic Study
    • Traffic Study Elements – Traffic Analysis Current Traffic Data Collection Traffic Forecasts • Construction Year • Interim Mine Operation (Year 5) •  Ultimate Mine Life (Year 20) Traffic Operation/LOS Analysis • Intersections • Corridor Need improvements? Traffic Study
    • Traffic Study Elements – Study Site Traffic Study
    • Traffic Study Elements – Key Intersections Traffic Study
    • Traffic Study Elements – Traffic Data § Traffic Data • Current Traffic Counts • Traffic Forecasts • Construction Year • Interim Mine Operation (Year 5) • Ultimate Mine (Year 20) Traffic Study
    • Current Traffic Counts § Data collection • Seasonal – peak season, non-peak season • Day – weekday, weekend • Time – AM and PM peak period • 6:30-8:00 AM, 5:00-7:00 PM • Seven (7) major intersections § Method • Manual traffic count • Video recording Traffic Study
    • Current Traffic Counts § 5 Different vehicle types • Motorcycle • Light duty vehicles (autos, pickup trucks, SUVs, etc.) • Buses • Median trucks (2-axle, 6-tire) • Heavy trucks (3 or more axles) § Truck traffic • Convert into the passenger car equivalent (PCE) factors for accurate Level of Service (LOS) analysis Traffic Study
    • Current Traffic Counts Traffic Study
    • Truck Volumes Study Site Traffic Study
    • Traffic Forecasts § Future land use § Update origin destination matrix § Assignment of trips Traffic Study
    • Traffic Forecasts § Traffic Forecasts • Project trip • Mine operation trip • Background trip • Regional growth • Pima Association of Governments (PAG) travel demand model • ADOT major projects Traffic Study
    • Level of Service Analysis§ Four analysis years • Current year (2008) • Construction year (2010) • Interim mine year (5 years) • Ultimate mine year (20 years) Traffic Study
    • Level of Service Analysis Current Year Construction Year Interim Mine Ultimate Mine Year (Year 5) Year (Year 20)Intersection LOS A-B LOS A-B LOS A-B LOS A-BLOSSegment LOS LOS B LOS C LOS C,D LOS C, DFindings Acceptable Acceptable LOS § Left turn issue § Left turn issue LOS § Non passing § Non passing zone issue zone issue § Need for § Need for roadway roadway geometric geometric modification modification Traffic Study
    • SimTraffic § SimTraffic Simulation Traffic Study
    • Roadway Assessment • Vehicle Type •  Vehicle Speed SAFETYROAD GEOMETRY •  Lane changing •  Lane width •  Speed • Shoulder Width •  Reaction time • Traffic separation • Refuge Lane • Intersections DRIVER S BEHAVIOR Traffic Study
    • Roadway Assessment § Safety analysis § Geometric analysis Traffic Study
    • Roadway Assessment – Safety analysis § ADOT accident data • Past 5 years accident data (8/1/2003 - 7/31/2008) • SR 83 from I-10 on-off ramps to SR 82 Traffic Study
    • Roadway Assessment – Safety analysis §  Federal Requirement •  Each state describe at least 5 percent of its locations currently exhibiting the most severe highway safety needs, in accordance with Sections 148 (c)(1)(D) and 148(g)(3)(A), of Title 23, United States Code •  Location should have at least one crash (fatal, any type of injury or property damage only) in each of the three years. •  Location should have at least one fatal crash in three years. •  At least one crash should be run-off-road, intersection, or pedestrian related. It should be noted that the intersection-related crashes considered here are the crashes in which the first harmful event occurred on an approach to or exit from an intersection, and resulted from an activity, behavior or control related to the movement of traffic units through the intersection (as defined by the American National Standard D16.1-1996, ANSI D16.1-1996). •  Total number of fatal or incapacitating injury crashes equal to or greater than three in those three years. Traffic Study
    • Roadway Assessment – Safety analysis § State Route 83, Post Mile 44 • Classified as top five percent § Any correlation on • Seasonal effect? • Traffic volume? • Roadway geometry? Traffic Study
    • Roadway Assessment – Safety analysis Traffic Study
    • Roadway Assessment – Geometric analysis Narrow shoulder (1 ) Steep curvature without guard rail next to downhill slope Traffic Study
    • Roadway Assessment – Geometric analysis Contributing poor sight distance Steep horizontal curvature with narrow shoulder and poor sight distance No median/refuge lane Traffic Study
    • Roadway Assessment – Geometric analysis § Safety elements • Curvature • Shoulder width • Lane configuration – maybe suggest the refuge lane or median • Provide sufficient • Stopping sight distance • Passing sight distance • Curve radius • Superelevation Traffic Study
    • Findings § Load of additional truck • Does not necessarily worsen traffic operation based on LOS • Does affect corridor delay • Need to correct with geometry improvements § Accident analysis • High correlation with roadway geometry rather than truck traffic § Few items to suggest for alternatives??? Traffic Study
    • QuestionsKekoa Anderson, P.E.kekoa.anderson@tetratech.com949.887.0731 Traffic Study