CCTV | DMS | HAR | RWIS | VSL | Dynamic Speed Displays | Ramp Meters| Curve Warning Systems| Intelligent Work Zones | ICWS

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

ENTERPRISE Transportation Pooled Fund Study

HAR Guideline 3 - Changing Traffic Conditions

Purpose: To notify drivers in advance of special changing traffic conditions and roadway configurations such as those associated with road construction or maintenance, traffic incidents or recurring congestion.

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

1a. The candidate location is upstream of an area with traffic control changes (e.g. lane closure, crossover, contra flow) where travelers would benefit from a verbal explanation.

OR

1b. Where you want to redirect a significant portion of traffic, or convey a message to them.