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2014 Reports and Technical Summaries

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2014 Reports and Technical Summaries

2014-27

Simplified Design Table for Minnesota Concrete Pavements

Final Report (PDF, 2 MB, 87 pages)

This project led to the creation of MnPCC-ME, a standalone 32-bit Windows executive program, to replace the preexisting RigidPave. Whereas RigidPave was based on the outdated AASHTO 1993 design procedure for rigid pavements, MnPCC-ME is based upon MEPDG version 1.1, a mechanistic-emperical design procedure.


2014-24

Development and Evaluation of Effective Turbidity Monitoring Methods for Construction Projects

Final Report (PDF, 7 MB, 158 pages)

This project investigates turbidity relationships for conditions of Minneosta and develops protocols for the design and installation of cost-effective monitoring systems.


2014-23

Evaluation of the Effect of MnPASS Lane Design on Mobility and Safety

Final Report (PDF, 9 MB, 164 pages)

This study focuses on the operational and design features of dynamically priced High Occupancy Toll (HOT) lanes. HOT lanes’ mobility and safety are contingent on the design of zones (“gates”) that drivers use to merge in or out of the facility. This study presents an assessment of safety and mobility on the two HOT facilities that were built using different design philosophies — the I-394 freeway and the I-35W HOT corridor. In addition, two design tools were developed, the first assisting in the optimal design of access zones based on traffic measurements, and the second allowing the assessment of the influence congested General Purpose Lanes can have on the mobility and safety of the HOT under different traffic conditions and utilization due to changes in pricing strategy.


2014-21

Evaluation Incorporating Highway Capacity Manual Unsignalized Pedestrian Crossing Analysis Methodology

Final Report (PDF, 1 MB, 284 pages)

This report provides a procedure for the evaluation of uncontrolled pedestrian crossings that takes into account accepted practice, safet and delay.


2014-20

Traffic Sign Life Expectancy

Final Report (PDF, 1 MB, 45 pages)

The primary goal of this research is to provide objective data about sign life based on the degradation of retroreflectivity and color over time.


2014-19

Investigation of the Impact of the I-94 ATM System on the Safety of the I-94 Commons High Crash Area

Final Report (PDF, 5 MB, 98 pages)
Technical Summary (PDF, 1 MB, 2 pages)

This project evaluated variable advisory speed limits implemented as part of the Active Traffic Management system for the I-94 Commons High-Crash Area. The variable speed limit advisories had minimal impact on safety, suggesting the need to improve VSL algorithms and reconsider their potential to affect driver behavior.


2014-18

Implementation of Floating Weir System for Surface Skimming of Temporary Stormwater Ponds

Final Report (PDF, 3 MB, 43 pages)
Technical Summary (PDF, 1 MB, 2 pages)

The purpose of this study is to provide design information for temporary stormwater ponds with floating head skimmers to remove suspended sediment and nutrient loads from stormwater runoff on active construction sites.


2014-17

Building Local Agency Capacity for Public Engagement in Local Road Systems Planning and Decision Making

Final Report (PDF, 8 MB, 91 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Aging infrastructure, changing patterns in road demand, and persistently constrained revenues challenge the sustainability of local road systems. This research is a comparative analysis of public engagement methods for involving stakeholders in decision-making about these complex issues.


2014-16

Load and Resistance Factor Design (LRFD) Pile Driving Project – Phase II Study

Final Report (PDF, 24 MB, 514 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Researchers reevaluated the pile driving formula and associated load resistance factors developed in Phase 1 of this study, compared its performance to other pile driving formulas, and recommended a new formula and resistance factors for implementation by MnDOT. The new pile driving formula developed in this study, MPF12, correlated very well, far outperforming all other equations. Researchers also conducted static load testing, investigated use of the formula for timber and prestressed precast concrete piles, and compared its predictions to the Wave Equation Analysis Program.


2014-15

Acoustic Emission Monitoring of a Fracture-Critical Bridge

Final Report (PDF, 5 MB, 236 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Researchers tested and optimized an acoustic emission bridge health monitoring system to sense cracking in fracture-critical steel bridges by using the system to collect data on the Cedar Avenue Bridge in Burnsville, Minnesota. The final report provides a framework for selecting appropriate acoustic emission equipment and formulating effective data processing methods for assessing the formation and growth of cracks in these bridges.


2014-14

Using Truck GPS Data for Freight Performance Analysis in the Twin Cities Metro Area

Final Report (PDF, 3 MB, 153 pages)
Technical Summary (PDF, 1 MB, 2 pages)

This project used commercially available truck GPS data to study freight performance on 38 corridors in the Twin Cities. Based on performance measures, including average truck volume, truck mobility, truck delay and truck travel time reliability, researchers identified the top bottlenecks for heavy truck traffic in the Twin Cities.


2014-13

Quantifying Moisture Effects in DCP and LWD Tests Using Unsaturated Mechanics

Final Report (PDF, 5 MB, 188 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Researchers developed computer models to assess the variability of dynamic cone penetrometer and lightweight deflectometer test results with differing amounts of moisture and fine particles. One of these models can be used to predict behavior for a relatively narrow range of base materials encompassed by MnDOT’s Class 5 specifications, but can be expanded to other materials with some improvements.


2014-12

Development of a Navigation System Using Smartphone and Bluetooth Technologies to Help the Visually Impaired Navigate Work Zones Safely

Final Report (PDF, 1 MB, 86 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Researchers developed and tested a new system to provide audible messages to help visually impaired pedestrians safely navigate through or around work zones. This system uses Bluetooth beacons attached to work zone infrastructure that send messages to a pedestrian’s smartphone app rather than the traditional method of beeping buttons that announce a message when pressed.


2014-11

Evaluation of Guide Sign Fonts

Final Report (PDF, 2 MB, 61 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Researchers funded through multi-state pooled fund TPF-5(262) evaluated the field performance of the Clearview 5W, E-Modified [E(Mod)] and Enhanced E(Mod) highway sign fonts to see if one font provided better legibility, especially at night. Using a closed-course test track, they found no statistical difference between the legibility of fonts, but concluded that luminance levels for the test were not enough to cause the halation effect that would lead to such differences.


2014-10

Advanced LED Warning System for Rural Intersections: Phase 2 (ALERT-2)

Final Report (PDF, 7 MB, 95 pages)
Technical Summary (PDF, 1 MB, 2 pages)

In this second phase of the Advanced LED Warning System for Rural Intersections (ALERT) project, the ALERT system is redesigned to mitigate the issue of vehicle roll-through at minor approaches with no intersection conflict. The ALERT-2 system also improves many aspects of the concept and basic technology.


2014-09

Analysis of Bridge Deck Cracking Data

Final Report (PDF, 6 MB, 69 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Cracking of the concrete decks on newly constructed bridges in Minnesota has become a significant concern. MnDOT has been collecting bridge deck construction and early age cracking information since 2005. Crack surveys were performed on 20 bridges. A statistical analysis of bridge data, including the updated crack surveys, was performed to determine if there were any relationships between variables collected on the forms and crack frequency, type, or time of development.


2014-08

Evaluating an Herbicide-Applying Mower for Invasive Species Controls

Final Report (PDF, 730 KB, 41 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Researchers conducted two tests to compare the effectiveness of the WetBlade to traditional broadcast herbicide application in controlling Canada thistle, a serious invasive species in Minnesota, and minimizing herbicide drift.


2014-07

Hot Mix Asphalt Surface Characteristics Related to Ride, Texture, Friction, Noise and Durability

Final Report (PDF, 2 MB, 116 pages)
Technical Summary (PDF, 1 MB, 2 pages)

The objective of this investigation was to develop a model to predict on-board sound intensity (OBSI) on hot mix asphalt pavements using on-site and laboratory data. The data used included noise and physical property data collected on 25 asphalt-surfaced roadway test sections at the MnROAD pavement testing facility.


2014-06

Research Using Waste Shingles for Stabilization or Dust Control for Gravel Roads and Shoulders

Final Report (PDF, 4 MB, 48 pages)
Technical Summary (PDF, 1 MB, 2 pages)

It is estimated that Minnesota generates more than 200,000 tons of shingle waste each year. Recently, a portion of this waste has been incorporated into hot-mixed asphalt (HMA) pavement mixtures. The current technology limits the amount of recycled asphalt shingles (RSA) in HMA to no more than 5 percent by weight. This leaves a lot of underutilized shingle waste material. This has prompted MnDOT to investigate other potential uses for RAS. One potential use is to improve the performance of gravel surfacing and reduce dust by replacing common additives, such as calcium chlorides, with RAS.


2014-05

Expanding and Streamlining of RTMC Freeway Network Performance Reporting Methodologies and Tools

Final Report (PDF, 14 MB, 106 pages)
Technical Summary (PDF, 1 MB, 2 pages)

To provide the Minnesota Department of Transportation with timely performance information regarding the Twin Cities freeway network, a streamlined program was developed based on existing and new methodologies. The Highway Automated Reporting Tool (HART) utilizes a user-friendly interface for corridor, date, time, and report selection.


2014-04

Effect of Signing and Lane Markings on the Safety of a Two-Lane Roundabout

Final Report (PDF, 4 MB, 72 pages)
Technical Summary (PDF, 1 MB, 2 pages)

This report presents a study of the impact lane markings and signing have on driving behavior at a two-lane roundabout located in Richfield, Minnesota. After its completion in 2008, this roundabout sustained a suspiciously high amount of crashes. In response, through this study, engineers experimented with changes in the roundabout’s signs and lane markings, as roundabout design regulations are relatively lax and nonspecific in contrast to those for standard signalized intersections.


2014-03

Value Increase and Value Capture: The Case of TH-610 in Maple Grove, Minnesota

Final Report (PDF, 5 MB, 36 pages)
Technical Summary (PDF, 1 MB, 2 pages)

Value capture is a novel way of financing transportation projects by determining how much a project will increase property values and then collecting money from affected property owners. Researchers used the completion of TH-610 in Maple Grove, Minnesota, as a case study to develop methods for projecting these increases and determining the potential revenue that could be generated from four value capture strategies. This project was the first attempt to quantify the potential financial impacts of value capture.


2014-02

Estimating the Crash Reduction and Vehicle Dynamics Effects of Flashing LED Stop Signs

Final Report (PDF, 1 MB, 2 pages)
Technical Summary (PDF, 1 MB, 2 pages)

In a field study, portable video equipment was used to record vehicle approaches at an intersection before and after installation of flashing LED stopsigns. After installing the flashing stop signs, there was no change in the relative proportion of clear stops to clear non-stops when minor approach drivers did not face opposing traffic, but the relative proportion of clear stops increased for drivers who did encounter opposing traffic.


2014-01

Culvert Repair Best Practices, Specifications and Special Provisions − Best Practices Guidelines

Final Report (PDF, 2 MB, 94 pages)
Technical Summary (PDF, 1 MB, 2 pages)

These guidelines provide guidance to Minnesota Department of Transportation (MnDOT) engineers in making better decisions on culvert repairs. New materials specifications, special provisions, and standard details will ensure adherence to standardized practices and increase the effectiveness and longevity of repairs. Focus is on repair of centerline culverts of 24 inches to 72 inches in diameter.

LRRB RIC Products

2014RIC51B

Traffic Data Collection Improvements

Final Report (PDF, 3 MB, 89 pages)
Technical Summary (PDF, 1 MB, 2 pages)

The Local Road Research Board (LRRB), with assistance from Sibley County and the Minnesota Department of Transportation (MnDOT), conducted a field evaluation of traffic data collection sensors. This study was initiated to explore low-cost and non-intrusive options to collect traffic data as possible alternatives to traditional methods such as tube counts, which require personnel to work close to or on the roadway rather than from a safer roadside position. This project reviewed new developments and alternatives to conventional road tube, inductive loop and piezo sensor data collection.


2014RIC51A

Traffic Data Collection Processes Study

Final Report (PDF, 0.3 MB, 16 pages)
Technical Summary (PDF, 1 MB, 2 pages)

The Minnesota Department of Transportation (MnDOT) collects traffic volume counts for cities and counties outside of the Twin Cities metro area. This research implementation project considered options for cities and counties to gather traffic data themselves. Researchers shadowed three data collection processes: MnDOT collecting the data (current process), the respective county collecting the data with equipment and training provided by MnDOT and a consultant collecting the data.


2014RIC16

Implementation of TONN2010

Final Report (PDF, 2 MB, 31 pages)
Technical Summary (PDF, 1 MB, 2 pages)

This report describes the implementation of the TONN 2010 analysis method for estimating spring load capacity of roads using pavement structure and traffic data, as well as results from the falling weight deflectometer. The resulting tool is a spreadsheet which combines the work of two other research projects – the FWD Viewer Tool and the TONN 2010 analysis. This project also included the development of training materials that were presented to county and state aid engineers throughout Minnesota.


2014RIC14

Putting Research into Practice: Enhancing Pavement Design Tools

Final Report (PDF, 2 MB, 31 pages)
Technical Summary (PDF, 1 MB, 2 pages)

The objective of this project was to review existing methods, data and tools for pavement design, maintenance and rehabilitation, and to recommend implementation and, in some cases, training needs for each.