Roundabout Deployment Guide

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The following deployment recommendations will ensure accurate data capture for roundabouts using the Scout Video Collection System.

Single-Camera Deployment

Roundabout 175ft

A single camera can be used to capture a roundabout location provided the following conditions are met:

  • All movements are within a distance of <175 feet (53 meters) of the camera location
  • All movements are fully visible around the entire roundabout (no vehicles disappear behind landscaping or other obstructions at any point)*

*If this condition cannot be met, multiple cameras will be required to fully capture roundabout volumes

Multiple Camera Deployment

When multiple cameras are used for a roundabout deployment, we cannot track vehicles directly from origin to destination. Instead, critical movements are captured, and a system of equations is used to approximate the volumes for each turning movement.

3- and 4-legged Roundabouts (2-4 cameras required)

4-Leg Multi-cam
When deploying multiple cameras to 3- and 4-legged roundabouts, the critical movement that must be completely captured on a single camera is vehicles making a first exit from each approach. When this movement is visible, the camera should also capture the following secondary movements:

  • Entering vehicles that continue circulating past their first exit
  • Circulating vehicles leaving the roundabout via the first exit approach
  • Circulating vehicles that continue circulating past the first exit approach

All movements must fall within a distance of <175 feet (53 meters) of the camera location

5-legged Roundabouts (2-5 cameras required)

5-leg multi-cam

When deploying multiple cameras to a 5-legged roundabout, the critical movements that must be completely captured on a single camera is vehicles making a first OR second exit from each approach. When these movements are visible, the camera should also capture the following secondary movements:

  • Entering vehicles that continue circulating past their second exit
  • Circulating vehicles leaving the roundabout via the first or second exit approaches
  • Circulating vehicles that continue circulating past the first and second exit approaches

All movements must fall within a distance of <175 feet (53 meters) of the camera location

Additional Information

If a roundabout location meets any of the following scenarios, the accuracy of the estimated turning movement data will be lowered, and/or it may not be possible to provide at all. In some cases a location can be cloned and processed as multiple Turning Movement Count (TMC) studies:

  • Approaches are unbalanced (for example, there are two entrance approaches before a first exit approach)
  • The distance between legs is greater than 175 feet (53 meters)
  • The roundabout has 6 or more legs
  • The roundabout has vehicles circulating in both directions

In these scenarios, please contact Customer Support for deployment recommendations.

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3 Comments

  1. Andy Wildgust

    hi, I found this and other articles useful. It would be helpful if there was a PRINT button so that the article/guide could be printed in a presentable format other than using the Internet Print option which includes detail that is not require at the start and the end of the pages.

    1. Lindsey Schneider

      Thanks Andy! This is great feedback and we will look at incorporating an easy-print option.

    2. Lindsey Schneider

      Hi Andy,

      I’ve added a print icon to all articles which will only print the actual article content. Give it a try when you can and feel free to reply if with further feedback!

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