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Planning Guidance for the Installation and Use of Technology Devices for Transportation Operations and Maintenance

ENTERPRISE Transportation Pooled Fund Study

DSDS Guideline 3 - Intelligent Work Zones

Purpose: To promote speed adherence in locations where posted speeds have temporarily been reduced for construction, maintenance or other traffic control.

Engineering judgment should be used to assess potential implications that may result from installation of DSDS.  This planning guideline does not mandate the use of DSDS.

1. The work zone is currently in operation and observations suggest that the 85th percentile speed at a location within the work zone exceeds the posted speed limit by at least 10 mph.

OR

2. The work zone area includes hazardous roadway conditions, such as a temporary unusually tight curve, or a rough road surface, requiring extra driving precaution.

Note: Signs tend to be most effective where there are two lanes or less in one direction of travel.