The purpose of this review is to assess the effectiveness and consistency of Work zone safety and mobility (WZSM) policies and practices for design, construction, maintenance and operations. The WZSM Process Review Team assessed the effectiveness and work towards consistent implementation and better understanding of current policies and practices throughout CDOT. The focus of this WZSM Process Review is to improve the safety and efficiency of work...

Positive protection is defined by Federal Highway Administration (FHWA) as "devices that contain and/or redirect vehicles and meet the crash worthiness evaluation criteria contained in NCHRP Report 350." By this definition, positive protection devices should prevent intrusion into the work area. These guidelines address the use of positive protection devices in work zones.

This report documents the results of a research project to support CDOT in the area of Safety Performance Function (SPF) development. The project involved collecting data and developing SPFs for ramp-freeway merge zones categorized as isolated, non-isolated and weave. For each of these three categories, data for the period 2007 to 2011 were collected at sites selected to ensure statewide geographical representation and coverage of the range of traffic...

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...