SPACING OF AN RQ2F ARRAY:

History and experience illustrate that an effective array of three RQ2F strips, properly spaced, alerts distracted and/or fatigued drivers with sufficient sound and vibration to refocus on their driving. 

As always, follow state DOT Traffic Control Plans (TCP) as to the number of strips per array. In the absence of a TCP, PSS recommends spacing between strips, based on posted speed limits at the deployment location, as shown below:

NUMBER OF ARRAYS IN A WORK ZONE:

PSS recommends the placement of two RQ2F arrays per lane per travel direction in advance of changes in road conditions. Two arrays will sufficiently alert drivers, especially distracted drivers, to those changing road conditions.

Traveling over the first array, produces sound and vibration designed to alert drivers to changing road conditions. The second array servers multiple functions. For example, it:

• Warns drivers that the first array was not debris and was deployed intentionally.
• Communicates to drivers that they will soon approach a change in road conditions and must take action.
• Alerts on-site workers, especially flaggers, that traffic is approaching.