Swareflex wildlife warning reflectors were installed on a four-mile section of road near Denver. Two half-mile test sections were alternately covered and uncovered for a three-month period to see if any significant change in deer-vehicle accidents could be detected. No accidents occurred in the test sections during the evaluation period. The cover/uncover evaluation method proved too costly for the limited budget of this study. Photometric measurements of the reflectors have been made using vehicle headlights as the light source. The use of wildlife warning reflectors should be discontinued until more evidence is available on their effectiveness--especially on mule deer. A regional pooled-fund study should be started to investigate the effect of the reflectors on mule deer. This needs to be a large-scale effort to obtain results in a short period of time and to ensure validity., Dave Woodham., Technical Report number: CDOT/DTD/R-91/11., In cooperation with the Federal Highway Administration., "July 1991.", Includes bibliographical references (page 6)., Final report., Print version record.
This study evaluates the strength and long-term performance of CFRP prestressed panels in a bridge deck, compare the behavior of bridge decks designed with the empirical and conventional methods of AASHTO, and a new limit-state design, and examinne the influence of lap splices between precast panels on deck cracking., Cover title., "Report No. CDOT-DTD-R-2003-11."--Cover., Mode of access: World Wide Web.
"Sponsored by the Colorado Department of Transportation, in cooperation with the U.S. Department of Transportation, Federal Highway Administration.", "February 2009.", "Report No. CDOT-DTD-R-2009-1.", Includes bibliographical references., Mode of access: World Wide Web.
This study focuses on the evaluation of bridge deck sealers commonly used on highway bridge decks and their relative performance., Yu-chang Liang, Benjamin Gallaher, Yunping Xi., "June 2014.", Prepared in cooperation with the US Department of Transportation, Federal Highway Administration., Bibliography: pages 54-57., Report No. CDOT-2014-6., Online resource; title from PDF cover (viewed April 2016)
In the past several decades, reinforced concrete structures have deteriorated similarly by chemical attack, especially chloride attack. For highway bridges, this phenomenon becomes more severe since bridges are exposed to extreme environmental conditions, such as snow and ice. In an effort to better protect the bridge decks and reduce maintenance costs. The use of WPMs was investigated by the Colorado Department of Transportation (CDOT) to analyze the performance of four products as an effective protection system., Yunping Xi, Linfei Li, René Railsback., "June 2018.", "Performing organization: University of Colorado, Department of Civil Engineering.", Includes bibliographical references (pages 60-62), Report No. CDOT-2018-16, Online resource; title from PDF cover (viewed August 2019)
Description based on online resource; title from PDF title page; (viewed December 2011), "Sponsored by the Colorado Department of Transportation in cooperation with the U.S. Department of Transportation, Federal Highway Administration.", "October 2011.", "Report No. CDOT-2011-13. Final report."--Cover., Includes bibliographical references (p. 57-61)
This report provides information on the design considerations of the embedded highway lighting design on Interstate-25 in Trinidad, Colorado, in terms of visibility. The information is based on visibility characterizations of small targets using luminance, illuminance, and contrast calculations as well as participant input on the detectability of small targets., Travis N. Terry, Ronald B. Gibbons., "February 2014.", Bibliography: page 47., "Sponsored by the Colorado Department of Transportation, in cooperation with the U.S. Department of Transportation, Federal Highway Administration.", Report no. CDOT 2013-17., Final report., Online resource; title from PDF cover (viewed March 2016)
An adequate longitudinal joint tie bar system is essential in the overall performance of concrete pavement. Excessive longitudinal joint openings are believed to be caused by either inadequate tie bar size or spacing or improper tie bar installation. If designed and installed properly, tie bars prevent the joints from opening and consequently improve load transfer efficiency between slabs and between slabs and shoulders, resulting in increased load carrying capacity. CDOT should adopt the mechanistic-empirical tie bar design procedure developed in this study., "Report No. CDOT-20011-12. Final Report."--Cover., Description based on online resource; title from PDF title page (viewed December 2011), "'September 2011.", "Sponsored by the Colorado Department of Transportation in cooperation with the U.S. Department of Transportation, Federal Highway Administration.", Includes bibliographical references (p. 84-85)
The results of this study confirm the performance of the baseline CDOT bridge deck mixes/systems, indicate some new products that show promise for implementation, and suggest that combinations of products might be the best approach to protection for Colorado bridge decks exposed to deicing chemicals., "December 2006.", "Report No. CDOT-2006-4.", Mode of access: World Wide Web.
This study sought to determine the technical feasibility of using seismic techniques to measure the laboratory and field seismic modulus of lime-stabilized soils (LSS), and to compare/correlate test results from bench-top (free-free resonance) seismic testing on LSS cylinders to in-situ (surface seismic) testing performed on field-constructed LSS. In addition, this research sought to develop a pilot specification for quality assurance (QA) of LSS using seismic test methods., by principal investigators, Michael A. Mooney, Richard G. Bearce., "Prepared in cooperation with the US Department of Transportation, Federal Highway Administration"--Technical report documentation page., "Prepared by Colorado School of Mines Dept. of Civil and Environmental Engineering.", "August 2013.", Bibliography: pages 74-76., Report no. CDOT 2013-15., Grant number 80-30, Final report., Online resource; title from PDF cover (viewed March 2016)
Final report., Performed by The SeaCrest Group in cooperation with the Federal Highway Administration for Colorado Dept. of Transportation at the request of the Colorado Association of Ski Towns (CAST) under contract no., "October 30, 2001.", Includes bibliographical references (p. 111-117)., Mode of access: World Wide Web.
Final report., Performed in cooperation with the Federal Highway Administration., "July 2002.", Includes bibliographical references (leaf 9)., Mode of access: World Wide Web.
Construction report., Cover title., Prepared in cooperation with the Federal Highway Administration., "March 1996.", Description based on print version record.
A report that evaluates the stability of re-vegetation of high elevation, decomposed, granite cut-slopes by using repeated applications of soil amendments., prepared by Vic Claassen., Introduction -- Methods -- Results -- Conclusions and recommendations -- References -- Appendix A: Reference graphs for N release from previous studies., "Sponsored by Colorado Department of Transportation in cooperation with the U.S. Department of Transportation Federal Highway Administration, Colorado Department of Transportation - Research Branch.", "July 2013.", Includes bibliographical references., Report no. CDOT 2013-14., Final report., Online resource; title from PDF cover (March 2016)
Poor bonding between asphalt pavement overlays and the substrate pavement layer can greatly influence the long term performance of hot mix asphalt (HMA) in the form of premature cracking and fatigue. The primary method to achieve bonding between layers is by hot mix asphalt (HMA) in the form of premature cracking and fatigue. The primary method to achieve bonding between layers is by using an asphalt emulsion tack coat. Additionally, field staff is charged with determining whether an existing pavement, especially a milled surface, is clean enough prior to tack coat placement, to ensure an adequate bond., Scott Shuler., "May 2018.", "Performed internally by CDOT-Research Office and Colorado State University.", Report No. CDOT-2018-14, Online resource; title from PDF cover (viewed August 2019)
In 2002, CDOT undertook this study in an effort to better understand the complexities of the Federal Highway Administration's new Traffic Noise Model (TNM). The research involved three analysis., "Report No. CDOT-2005-21.", "November 2006.", "Sponsored by: Colorado Department of Transportation In Cooperation with the U.S. Department of Transportation Federal Highway Administration.", Includes bibliographical references (p. 30).
