Colorado. Division of Highways. Planning and Research Division.

Twenty-seven flexible pavement projects 15 to 16 years old were investigated to correlate performance with moisture, traffic, soil, and designed conditions. The findings of this study provided a basis for determining the structural adequacy of Colorado highways by means of serviceability Index values.

Several years before the publication of the 1970 Manual on Uniform Traffic Control Divices (MUTD), the Colorado Division of Highways initiated field tests to investigate the relative brightness and durability of yellow and white paint stripes in the beaded and unbeaded condition and to determine the acceptability of partially-beaded centerlines. After the issuance of the 1970 edition of the Manual, the Division sought and received FHWA approval for...

Mechanical ventilation of tunnels is costly because of the initial installation and the continued maintenance and operation. However, at some tunnel length corresponding to a particular altitude, traffic configuration and topography there is a need for this forced ventilation. This study was undertaken to help determine the pollution concentration in existing tunnels in Colorado, and predict the length of tunnels which will need mechanical ventilation....

The results of laboratory testing indicate that absorptive form liner improves the quality of horizontal surfaces of concrete if placed while the concrete is still plastic.

This particular Colorado study was initiated to gather and analyze facts on the performance of embankments constructed without moisture and/or density control, and to draw specific conclusions which might assist designers of future roadway embankments.